We got called out to this lovely old John Tann safe, where the owner had the keys but the door wouldn't open. After drilling an exploratory 6mm hole into the door, an endoscope was used to determine if all the bolts were retracted when unlocked. They were all working fine, so after a lot of pulling on the door to no avail, and a lot of shoulder shrugging and head scratching I caught a glimpse of a guy going past on a forklift (the safe was located at a builders merchant). We managed to convince him to give us a gentle pull on the door with the forklift and after a massive amount of pressure the door sprung open, much to my relief. Once opened, it was discovered that the door had dropped by approximately 2 mm and a tiny bit of ripped paper about the size of a postage stamp was stuck in the bottom causing the lock out ....every day's a school day as they say!