I got a better idea, FIRE all the teenagers who work and go to high school, and give those Jobs to people out of work who have kids and bills. Not some stupid kid who's gonna go out and spend it all on stupid junk.
Generalize much?
There are a lot of high school kids who work for legitimate reasons, first of all, and secondly, institutionally firing them without legitimate cause ("someone else could use their job" is not legitimate) would and SHOULD spark a wave of lawsuits against those doing the firing.