It's just a hunk of steel. If kids hanging off it could hurt it, it's not much of a safe.
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Since we're talking about gun safes, they're just light weight sheet metal, and they aren't much of a safe
Others have brought up chipped paint, indicating that the door was closed with the bolts extended. This can bend those bolts if the door was slammed (most light weight gun safes lack boltwork substantial enough to prevent this). Slamming the door can also cause the back of the lock to loosen or begin to break, which can fire the relock. People like to jerk on the handle while the safe is locked. I have never understood why they think that tuning the handle harder will open it, but I see it all the time. This can damage whatever that particular manufacturer uses to prevent excessive handle force. This can also loosen the entire assembly (keep in mind we're talking light weight sheet steel) so that there is excessive play.
Wiring ripped out of electronic locks is typical. Mechanical locks are a bit more difficult to damage, but not impossible. People spinning the dial hard and fast can damage the internal components of a lock.
Let's not forget that safes are designed to keep people out. They are supposed to break when excessive force is applied. The safe doesn't know if it's a burglar, or a customer at a safe shop doing the abuse. Slamming doors, dropping the safe, smacking the dial, forcing handles, etc., are all things that can and will cause the safe to not let you back in.