safe. It also gets cheaper to open them if you're allowed to destroy significant components of the lock, i.e. you don't have to put it back into service that day.
Ask the maker how to open it (destructively). They will readily tell you what the construction is. If the material is single layer alloy steel (almost every modern safe that isn't fireproof, or built-in to order), then hire a plasma cutter & compressor and slab it up on site. This is _very_ easy. Then sell the steel to a scrappy who knows what the alloy is, and pays the appropriate premium for it. A door and surround, removed in one piece by cutting the carcase, is worth money as S/H spares.
Otherwise hire a safe specialist to remove it. This is cheaper than having them opened (as it's light enough to lift easily).
Don't ever attack the hinges, especially if they're external. The door bolts on both sides. One of my safes was acquired in this way, after the owners decided to "open it easily" by removing the hinges.