Mini Lock Box Puzzle

What is this puzzle?
It is a small box with four key holes on the outside. If a key is inserted into any one of the key holes, the box is unable to be opened. Therefore, all four keys must be removed for the content inside to be revealed.
How does it work?
The keys and their respective holes are structured similar to a circular maze. You must rotate and push/pull on the key in order to find an exit to the maze. And similar to a maze, there are dead ends, so based on luck, you can get really lucky on the first try, or you can be stuck on one key for over 20 minutes. Since there are four key holes with different mazes, you have four chances to test your luck and skill.
What makes it good?
This puzzle has the advantage of being able to be replayed many times. The keys can be inserted back in easily by pushing and blindly rotating the key as it goes in. And because of the amount of key holes and the material being opaque, it's extremely likely that the next time you play it, you won't