A key has snapped in the lock. What now?
4 min read · written for Fourways
A snapped key looks like a disaster and usually is not. The broken half normally comes out cleanly and the cylinder survives. What decides it is almost entirely what happens in the twenty minutes afterwards.
Do nothing, on purpose
The most reliable way to turn an easy extraction into a hard one is pushing the fragment deeper — with a screwdriver, a paperclip, a hairpin, or the remaining half of the key. Past the mouth of the plug there is far less for a tool to catch.
Do not spray lubricant either. It makes the piece slippery against extraction tools and gathers dust. If enough of the key protrudes to grip firmly, pull straight out with no twisting. Otherwise leave it entirely.
Why it broke
Keys bend 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. That point is usually the shoulder where the blade meets the head.
So a key that snapped is evidence about the lock, not about the key. If it had been getting harder to turn, the cause was already there.
How it actually comes out
Extraction tools are thin hooks and fine saw-toothed blades that slide into the keyway beside the fragment, catch a cut edge and draw it back. Delicate rather than forceful, and a competent extraction leaves nothing to show for it.
The plug generally has to return to neutral before anything will come out, which is why turning the broken half in the lock makes matters worse rather than better.
Drilling exists for fragments jammed beyond reach or locks already damaged. It should be explained before it happens, not found on the invoice.
Afterwards
Another key into the same stiff lock invites the same result within months. Having the cylinder cleaned and the door alignment checked at the same visit is the difference between one incident and several.
If the snapped key was your only one, that becomes a separate conversation about rekeying rather than about the fragment.
In a car, we cannot help
We can open a locked vehicle. 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 first rather than us saves a callout fee, and we would rather say that plainly than tell you in your driveway.
Rather ask than read
Not sure how this applies to your door?
Services this relates to
Broken Key Extraction
The key gave way and the rest is still in the lock. Removed cleanly, cylinder usually saved.
Lock Repair
Doors move with the seasons and locks take the strain. Adjusted and repaired before they strand you.
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