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.

At 6 inches high, the Undercover safe fits under my bed, but if you have a lower bed frame or one with lower supports, you may need to snag some bed risers (luckily, you can find them for cheap). Even ...