If thats the case it still might be possible to replace the mortise style lock that was originally built into the door.
Lock on screen door not working.
Tap the end of a chisel under the door stop on the striker side of the jamb.
If your door key doesn t work right the first and most obvious step is to be sure you re using the right key.
The lock mechanism may not work simply because the lock is dirty or dry and needs to be lubricated with graphite do not use any type of oil because this will gum up the works.
For other types of problems with door knobs and locks please see repairing door knobs hardware.
An improperly functioning latch may be the result of a poorly fitting door.
If not proceed to the next method.
Sometimes this just takes patience.
They work fine if you have room between the sliding door and the screen door.
If the lock isn t getting power hold the lock switch either up or down and then open and close the door repeatedly to see if the lock will work.
When your screen door won t latch properly and pops back open or does not close all the way the latch plate is in the wrong position on the doorjamb.
Cylinder will then pull out.
Check if it helps.
Firstly for a whitco mk ii tasman lock the lock needs to be in the locked position.
You have a broken wire.
T s possible the door may not be aligned properly now so the latch is missing it s hole.
Refer the link below for safe mode steps.
Check if the issue persists in safe mode.
To do this when door is open you will need to press the deadlatching pin which sits above the main latch next you will need to undo the cylinder retaining screw then insert and turn key to lock position.
These locks mount right on the inside of the screen door.
Sorry that we feel the need to state the obvious assuming that you re using the right key keep working it until it turns the lock.
If it won t lock open the door.
Pry up on it until it comes loose and remove it.
Check in safe mode and clean boot.
If it works sometimes you probably have a broken wire.
This may be caused by the latch plates.
No it s all aligned the latch goes through the hole in the strike plate nicely once the auxiliary bolt is pressed.
Shut the door and try to lock it.