Yes, locking people into buildings (which is what you are doing if you need a key to get out, whether it's an RFID badge or a skeleton key) has been illegal since the Triangle Shirtwaist Factory Fire
As I mentioned in a sibling comment, you don't lock them in, you just set off major alarms and send an armed response if the door ever opens without badge activation. This presupposes some things about the facility and the facility operator, though.
