Depends on what kind of school you are talking about... if you are in high school, then fast food, food service (like restaurants) and retail are about all you re going to be able to get. If it s college school schedule, then that depends on what kind of experience you have and what kind of jobs you might be able to get.
You could try a retail clothing store or something like that. Also, you could try Worlds of Fun or Oceans of Fun in the summer.