you've been watching the Walmart "documentaries", havent you?
May Co and other retailers don't have the same practices of underpaying..so what you are doing is assuming that everybody operates the same way.
1) X-mas help is part time business and filled by flex workers, high school/college kids that are not supporting families. Many of the others are second workers in a homestead. (as is my sis-in law and my niece in law).
2) Full time jobs at retailers do exist and do pay benefits. Not everyone is an hourly front-liner.
3) Your estimates are a shade on the high side.
And there are places where it could be much worse to be unskilled labor...really my main point. I survived 2 years at min wage (5.75). Was it fun? No. Was it possible? Yes. (at least in the part of WV where I was located). Could I have raised a family on it. Not a chance. (your point).