I'm guessing a lot of the teenagers that apply to work at restaurants that do these illegal, unpaid "trial shifts" aren't aware of how illegal that is so they probably get away with it for far longer than they should.

Shit, a lot of adults in the US don't know their federal and state rights as employees thanks to lack of education on labor laws. Laws only work if everyone is aware of them. Can't report something if you don't know it's wrong in the first place.

I had thousands stolen from me in unpaid wages a few years ago and nothing happened when I reported it. Our institutions in the US are crumbling a little more year after year