When the unions raise the cost of fast food, will the poor eat at home?

I wonder how many of the fast food marchers yesterday were actually working for minimum wage or if they are hired by the unions. $15/hour for a teen to learn to wipe tables and sweep the floor? Not going to happen. And if the beginner gets $15, what does the counter person who's been there 3 years get, or the assistant manager? Don't their wages go up too? According to the BLS, 2% are paid minimum, and they are mostly young and part time. The percentage has dropped dramatically in the last 40 years--and maybe that's good, but probably not, since usually a worker’s first job is minimum wage and that's where we learn. I wasn't worth what I was paid at my first job, but it was a learning experience.