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.
How to remove lock cylinder from store room door.
This can be done in multiple ways.
Many homeowners have old doors somewhere in the house that they no longer have the keys for.
If these doors are locked it can be difficult to remove the lock and replace it with a unit that works.
This is the easiest way to rekey your door if you re giving the cylin.
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.
Slide the bars slightly away from the cylinder towards the vertical sides of the doorframe.
How to remove cylinder door locks.
Push the cylinder out of the lock maybe you need to push hard step 2.
Measure the size of the old cylinder.
Remove the old cylinder from your door.
Locate the lock cylinder on the interior face of the door.
This is a video on how to replace the key cylinder in a commercial storefront door.
Remove the nuts and bolts securing the lock bars to the cylinder with a wrench.
Another way to unlock a door without a key is to simply work on making the door and its accompanying door lock somewhat irrelevant.