I had to open an electronic digital safe where the battery had run down, the customer had ignored the low battery noises and lights the poor thing had been making for a couple of months, and where the override key had been locked inside the safe. This was one of those sub-£100 “safes” that you can get from B&Q or Home Base (Home Depot).
Now that’s not particularly unusual. However, the other teensy mistake that I’d advise anyone else not to make was that the safe wasn’t bolted down. Even a safe that weighs 50 kg is usually bolted down to prevent a burglar with a pallet truck just wheeling it away. With a safe that you can tuck under your arm bolting it down becomes pretty much essential.