A key has snapped in the lock. Now what?

Stop touching it

The most reliable way to turn an easy extraction into a difficult one is pushing the fragment deeper — with a screwdriver, a paperclip, a hairpin, or the half still in your hand. Past the mouth of the plug there is much less for a tool to grip.

Do not spray lubricant. It makes the piece slippery against extraction tools and collects dust. If enough protrudes to grip firmly between finger and thumb, pull straight out without twisting. Otherwise leave it.

Why it broke

Keys flex slightly every time they fight a stiff cylinder or a misaligned door, and metal that flexes repeatedly at one point work-hardens until it fails — usually at the shoulder where blade meets head.

So the snapped key is evidence about the lock rather than about the key. If it had been getting harder to turn, the cause was already present.

How it comes out

Extraction tools are slim hooks and fine saw-toothed blades that slide into the keyway beside the fragment, catch on a cut edge and draw it back. Delicate rather than forceful; a competent extraction leaves no mark.

The plug generally has to be returned to neutral before anything will come out, which is exactly why turning the broken half makes things worse.

Drilling exists for fragments jammed beyond reach or locks already damaged. It should be explained before it happens rather than discovered on the invoice.

On a commercial door, look wider

A key snapping in a business entrance is rarely isolated. High-traffic cylinders wear faster, and if one key has failed the others in circulation have been through the same mechanism.

Having the lock cleaned and adjusted at the same visit is the difference between one incident and three over the following months. Body corporates and offices are covered by commercial locksmith services.

Vehicles are outside what we do

We can open a locked car. We do not work on vehicle keys at all, so anything requiring a replacement key needs a vehicle key specialist or your dealer.

Phoning them rather than us saves a wasted callout, and we would rather say so plainly.

Why forcing it makes everything worse

It is worth understanding the mechanism, because knowing why usually stops people trying.

The fragment sits in the keyway with its cuts still engaging the pins, and the plug has generally been left rotated part-way, which traps the piece against the housing. Getting the plug back to neutral is most of the skill in the job, and it is exactly what pushing or twisting makes impossible.

Pliers add a second problem. They push the broken piece deeper, past the point where a hooked extractor can catch its cuts, and they score the plug on the way in. That is how a twenty-minute job becomes a lock change, and it happens in the ten minutes before anybody arrives.

Why keys snap, and what it says about the lock

A key almost never snaps because it was weak. It snaps because it was being asked to do work it was not designed for — turning a mechanism that has become stiff enough to need force.

So the snap is the end of a process rather than an event. The cylinder has been stiffening for weeks or months, the key has been taking more and more torque, and metal fatigue does the rest at the shoulder where the blade is thinnest.

That is why extraction is frequently only half the job. Get the fragment out of a cylinder that is still seized and the next key will snap in it too, usually within the month. The underlying fault has to be dealt with in the same visit, and on outdoor hardware that is nearly always grit rather than wear.

Outdoor locks and the Highveld cycle

Security gates, driveway gates and garage side doors account for most snapped keys around Sandton and the rest of Johannesburg, Gauteng, and the weather is the reason.

Dust through the dry months works into the keyway. Summer storms wash it deeper. A dry winter sets it into a paste that grinds against the wards on every turn. Nothing about that is unusual and all of it is preventable with a strip, a clean and the right lubricant once a year. Anything that genuinely cannot wait is handled as an emergency locksmith call, at any hour.

A general-purpose spray is worse than nothing here. It flushes the grit temporarily, then attracts more dust than the lock had before. A proper lock lubricant is a different product and costs very little.

What we actually do on arrival

The plug is returned to neutral first, because a rotated plug traps the fragment. Then the piece is drawn out with an extractor that catches the cuts, working with the pins rather than against them.

Most extractions are non-destructive and the lock is left working afterwards. Where the key has been forced deeper by pliers or a screwdriver, or where the plug itself has been damaged, drilling is sometimes the only route left — and that is explained, with the cost of making good, before it happens.

Then the cause gets dealt with: a clean, a lubricant, an alignment check, and a straight answer about whether the cylinder is worn enough to be worth replacing while the technician is already there. That is ordinary lock repair and it is far cheaper as part of a visit you are already paying for.

What to do in the ten minutes before we arrive

Nothing to the lock. That is the whole instruction, and it is the hardest one to follow.

Do not push the fragment, do not turn it, do not reach for pliers, and do not try the spare key — a second key forced into a keyway that already contains half of the first one damages both. If part of the key is protruding and comes away between two fingers without any force at all, that is fine; anything requiring effort is not.

Meanwhile, check whether there is another way into the property, because a snapped key in a security gate does not always mean you are locked out. And if you are shut out with somebody inside, say so when you phone, because that changes the priority of the call rather than the method.

Preventing the next one

The cure is almost embarrassingly simple and it is skipped on nearly every property here. Once a year, work every outdoor lock — security gates, driveway gate, garage side door, store room, the gate nobody uses — and lubricate anything that has begun to stiffen.

Use a proper lock lubricant rather than a general-purpose spray. The wrong product flushes the grit temporarily and then attracts more dust than the lock had before, which is why locks treated with it are frequently worse a season later.

The other half is the key itself. A key worn thin over fifteen years is a key that will eventually break regardless of the lock, and a fresh copy cut from the original rather than from a worn duplicate costs almost nothing.

When the fragment is not the whole story

Two situations where getting the piece out is not the end of the job. The first is a key that broke because the cylinder had been stiffening for months, which means the underlying fault is still sitting there once the metal is removed.

The second is a key broken in an outdoor lock — a security gate, a driveway gate, a garage side door. Those seize because of what the Highveld does to anything facing the weather, and a cylinder in that state will break the next key too.

Either way the sensible thing is to deal with the cause in the same visit rather than booking a second one. Most of it is ordinary lock repair in Rivonia — a strip, a clean, a proper lubricant and an alignment check — and it is far cheaper as part of a call you are already making.

What to do if it happens at a business

On premises the priority order changes. The first question is not the key, it is whether the door can be secured at close of business, because a shopfront or office entrance that cannot be locked is an overnight exposure rather than an inconvenience.

Say that when you phone. A door that cannot be locked is treated as urgent regardless of the hour, and the usual approach is to make the premises secure that evening and finish the job properly outside trading hours.

The other difference is keys. A snapped key on a business door frequently means several people are now without access, so it is worth knowing before the technician leaves how many working keys exist and whether the cylinder should simply be changed while the door is open anyway — which is a lock change in Rivonia folded into work already being done.

The spare key question

A snapped key raises an immediate practical problem that has nothing to do with the lock: whether anybody else can get in.

If a spare exists with a neighbour or a family member, that is frequently faster than a callout, particularly outside the ring where an arrival window is longer. It is worth checking before phoning rather than after.

If no spare exists, that is worth fixing once the door is open. A spare with somebody nearby, or a properly fixed key safe outside the property, costs very little and prevents the next version of this call — and it is the sort of thing dealt with while a technician is already there on a house lockout.