At some point relatively soon, 90% of these jobs will be done by computers and robots.
Pushing minimum wage too high only speeds up that timeline.
Best of all, there will be no human secretions in our food.
There was an article posted not too long ago about robots doing these jobs in China:
http://www.freerepublic.com/focus/news/3044282/posts
The irony is that greater productivity and use of robots and computers will mean a greater ability of society to support more inefficiency in other areas, such as a larger unemployed, unproductive, uneducated class.
On a different but related topic, it also means a larger state sector - more production means that taxes can grow and the FED can print more money. The average worker will not see the benefits of productivity in terms of higher real wages - that will be siphoned off to support a larger state sector.
The guy who runs despair.com has a video in which employees at the call center are complaining about the working conditions. So instead of fixing the problems, he conveniently lays out brochures on outsourcing to India. The employees get worried and shut up. So, if I owned a fast food restaurant, I would conveniently place in the break-room brochures on Chinese Robots making burgers and Taco.