They were not very secure doors, were a retrofit to existing doors. Basically yhe company that installed them removed the striker plate from the frame and installs their own with a soloniod which releases and then a card reader on the wall in front of it. I found that there was enough of a gap in their release system I could slide the knife blade inside and push the lock open. I could only move it a little bit at a time so I would pull out on the door to hold it in place while I moved the knife blade back to get another grip on it. Came in handy with all the power outages or if I left my card at home.