The doorknob on the interior side would turn and open the door whether the knob was locked or unlocked.
Turn the lock door.
You can spray a little dry lubricant in the lock to free up the plug.
However the two sides of a lock assembly are a mirror image of one another and any lock can be installed with the keyhole facing either direction.
Doors with a twisted tab lock are still easy to get past even if that tab is set to lock these locks appear on the handle of a door when either facing laterally or vertically the door will be locked or unlocked.
Out of all the door lock problems that have been discussed this is probably.
My family has always had the sort of knobs that won t turn at all when the door is locked and has grown accustomed to interpreting a turning doorknob as one that will not lock behind them.
If you place your key into your door lock cylinder and turn it you should be able to lock or unlock your door.
That can cause the pins to get stuck in a partially raised position and prevent the plug from turning.
If that is the problem it is easy to fix.
Shut the door and try to lock it.
Try to turn the doorknob and push the door open.
If it won t lock open the door.
To remove the key turn it counter clockwise back to the position at which you slid it in but no further.
However if you insert the key and the entire lock cylinder turns it is a sign that you have a bigger door lock problem at hand that needs to be addressed.
Pull the hanger toward.
Twisting the portruding tab on the knob will lock the door.
The lock is set from inside the door.
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If you turn the key far enough the door should lock.
Spray the lock with lubricant to remove dirt and dust.
Outdoor locks can collect a lot of dirt and dust inside the lock cylinder.
Pry up on it until it comes loose and remove it.
Tap the end of a chisel under the door stop on the striker side of the jamb.