Push the cylinder out of the lock maybe you need to push hard step 2.
How to remove lock cylinder from store room door.
This is a video on how to replace the key cylinder in a commercial storefront door.
If these doors are locked it can be difficult to remove the lock and replace it with a unit that works.
Remove the nuts and bolts securing the lock bars to the cylinder with a wrench.
Remove the old cylinder from your door.
Place the nuts and bolts aside.
Locate the lock cylinder on the interior face of the door.
This is the easiest way to rekey your door if you re giving the cylin.
Slide the bars slightly away from the cylinder towards the vertical sides of the doorframe.
Measure the size of the old cylinder.
If you are able to gain access to the interior of the room through a window or some other means this is usually the easiest way to remove the lock.
One of the most common ways to accomplish this is to kick the door down or ram it so that the lock is dislodged from the door jamb.
If you want to keep the lock handle and trim on a door but need to have the lock changed you can just replace the cylinder inside a pin and tumbler lock.
Unscrew the main screw red dot place the key inside the cylinder and turn it to the left or right to make sure that the carrier is parallel with the cylinder.
This can be done in multiple ways.