Here is the handle and keypad of a Sistec safe with a failed electronic Cawi lock. The Cawi digital lock is pretty reliable and user friendly, this one however had an unknown fault and refused to work. In the case of an electronic lock if it fails there is
very little you can do apart from resort to the drill. Using specialist drill bits and a technique I had seen another engineer do I managed to open this safe with no damage to the integrity of the container. The clever design of this unit is that the top lock needs to be open before the handle can move. Under this handle is another keyhole, for a secondary lock. So you have to crack on lock just to get to the next one.