Out of all the door lock problems that have been discussed this is probably.
Turn the lock door.
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.
Tap the end of a chisel under the door stop on the striker side of the jamb.
Once the hanger is in position hold it with one hand and grab the doorknob with other applying some turning force in the direction the knob would turn if it were unlocked.
Pry up on it until it comes loose and remove it.
The lock is set from inside the door.
Outdoor locks can collect a lot of dirt and dust inside the lock cylinder.
Spray the lock with lubricant to remove dirt and dust.
If you place your key into your door lock cylinder and turn it you should be able to lock or unlock your door.
You can spray a little dry lubricant in the lock to free up the plug.
Pull the key out of the keyhole.
Try to turn the doorknob and push the door open.
If it won t lock open the door.
If that is the problem it is easy to fix.
If you turn the key far enough the door should lock.
That can cause the pins to get stuck in a partially raised position and prevent the plug from turning.
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.
To remove the key turn it counter clockwise back to the position at which you slid it in but no further.
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.
Shut the door and try to lock it.
Pull the hanger toward.
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Twisting the portruding tab on the knob will lock the door.