You wake up to the smell of coffee and bacon, you're in a diner. You have no memory of how you got here. The only thing you know is that you are hungry and need to escape.
There is a chest in the middle of the room. It is locked with a combination lock. The lock has three dials, each with the numbers 0-9. You see a note on the chest that reads:
I am taken from a mine, and shut up in a wooden case, from which I am never released, and yet I am used by almost every human being. What am I?
What combination do you enter?