Easy; imagine improving yourself and you still can’t get a decent wage. I oppose these minimum wage hikes because they are job-killers, but I assume they are in the works because most of the remaining jobs in this country are McJobs. The information superhighway has let many white-collar jobs follow blue-collar jobs overseas; what is left for many are jobs providing for the material comforts of the 1%. If everyone went to college/trade school, we would still have this same problem: Employers prefer to pay foreign workers much less than they would have to pay us, so our available jobs are Wal-Mart greeters, burger flippers, and dog walkers.
In my area illegal braceros were already getting $10/hour (25% above minimum wage) 10 years ago; $15/hour would not let you start a family in the NYC metro area (including northern NJ).