How do I open the locker?

Hint 1 of 5:

Read the sign.

Hint 2 of 5:

Specific answers are coming up in the next hints.

Hint 3 of 5:

Turn the left and the middle one.

Hint 4 of 5:

Turn the left and the right.

Hint 5 of 5:

Turn the left and the middle.