Here is magnetic lock prototype that works like a real one, but uses magnets and gravity instead of springs. If you like this ...

How to Make Safe with Combination Lock from Cardboard For this project you need cardboard, glue gun and few wooden sticks.

Owners who want to use this safe to hold home-defense guns should set up the biometric lock. I can get into my safe with the touch of a finger. You’ll see a ring glow green, then hear the bolt open.

Advocates for safe gun storage cite research that it reduces the likelihood of firearm-related deaths and injuries in children.