The school of hard knocks is what most teenagers need. Otherwise they end up in college, in debt, no real skills, and a international communication degree with no job prospects.
The students who will succeed likely will be able to handle employment and school. Aren't most high schools now days, you show, you pass?
Can we think of other way's to make teenagers less attractive as part time employees?
If they don't get out of school until early evening, I would consider them mostly un-employable. Oh well, its not like they are in an economy that can support them... and surely this won't lead to a sense of entitlement later in life.