perhaps the friction for minors looking for a job exists for good reason. the focus at that age should be school, not work, i recognize that there are those less fortunate that can't afford to do school sans work, but the solution to that should be financial aid, not making them work. society's goal should be to get a more educated populace, by lowering the friction to enter the workforce at such a young age you're endangering that group of kids on the edge who, given more friction, would have stayed in school and gone to do greater things, but since it was so easy to get into work so early they lowered the overall potential of their lives.
so regarding the poor families this would supposedly help, I'd argue it's more complicated than that, and what this may be doing is providing short term help while sacrificing long term social mobility. keep the poor working and not learning and they'll mostly stay poor.
there's nothing wrong of course with a part time gig to get accustomed to different responsibilities, but it should remain restricted to that. you've got your entire life to work full-time, there's no need to rush things.