My brother has autism, pretty severe, and worked at Bob Evans, through a program with the county, this past summer where he cleaned dishes and tables. He's in high school the rest of the year and spends half the day taking out trash, cleaning lunch tables, sweeping floors and other miscellaneous things. I would try to contact somebody in the county about possible opportunities.
I know a couple of people with autism at UPS and they are great workers. But in all honesty, having autism can be rough while working at UPS just because management is so aggressive. I've had to help one guy with autism, who loads trailers with a 500 pph, calm down many times just because of the way supervisors yell.