In Nancy Drew: Treasure in the Royal Tower, Nancy has a locker for her ski equipment. Here’s how to find your combination and open a locker: head down to the basement, step into the locker room and rotate to your right to find locker #310. Rotate the dial to 5 and click on the top arrow to enter that number. Rotate to 1 and click the arrow, then the 7 to complete the combination. It doesn’t work! Talk to Jacques and he’ll tell you to try that combo on locker #311.
(You will never open your own locker – #310 – in the game.)