No, you cannot. However, I'm 16 and I work at Gamestop as a Game Advisor. You have to be at least 18 to become a manager, etc. It's a common misconception that you have to be 18 to work there at all. You have to be at least 16 years old.
Yes you can for no more than: 3 hours on a school day, 18 hours in a school week, 8 hours on a non-school day, and 40 hours in non-school week. where at