I have a bathroom doorknob that when I lock, nothing happens to the lock

(by lock I mean the thing that moves and stops the door from moving I don't know if there is a technical term)

I can pull the lock out which seems to be the current position it SHOULD be in when I lock it but it never seems to go in that position. The doorknob can still move when I twist it but it never seems to fully extend when I lock it. The problem doesn't seem to be the strike plate being misaligned, at this point I don't know

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    You have to help us here. We have no way of knowing what kind of a lock you have unless you specifically tell us. Type and make of lock would help but mostly post some clear pictures and edit your question stating in clear sentences the problem you're having. You also should take our tour so you know how to best use this site. – HoneyDo Feb 5 at 5:23

I've encountered this issue before and the repair is easy.

The problem is with the lock (latch) being misaligned. This is the part of the door knob that moves back and forth and holds the door closed.

With a screwdriver loosen the 2 screws holding it in place. 1-2 turns should be enough. Twist the door knob to check if the latch moves freely.

If it doesn't verify that the latch is lined up correctly with (and not rubbing against) the latch plate (the plate guiding the latch).

If still not working correctly loosen the 2 screws that hold the door knobs together. Move them until the retracted and stuck latch springs out and then re-tighten the screws.

It's tempting to use an aerosol lubricant to free the latch (i'm guilty of this too), but it doesn't help in the long term. It will attract dust and build up grime that hinders the door lock mechanism.

Sometimes it's less hassle to install a new door knob.

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