A law suit against humanity?
you can open a doorknob type lock with a credit card(especially the cheaper ones) but not a deadbolt. ON the part that goes from the lock into the frame of the building(the part that moves into the door when you open it) is a small cylindrical shaft behind the main one that is designed to prevent this; but it can be easily circumnavigated
Sure. Bend about 1/4 inch over to the back side of the sheet on all the edges. That should leave a rounded edge. Another solution would be to frame the sheet with say a 1x2 cedar or pine. Just depends on how much you want to spend and how much time you have to accomplish this.