I believe food and merchandise still hire minors at UO. Shrek has had minors in the past, certain attractions (aka shows) can have minors because there isn't as big a safety risk (meaning you're not in charge of guest safety as much as you would if you were at a coaster).
Things could've changed, though. Don't take anything I'm saying as solid, just friendly advice. Your best bet is to just try applying online at UniversalOrlandoJobs.com
Good luck!