Hi Dennis,
I'm English, so sorry but I dont know about life in America. Are there any people to speak to , who give careers advice? Maybe they could advise on different types of careers that may suit you, or if there are any state grants to have, if it means coming off disability income and getting into some sort of self-employment even. Or are there any grants to set up your own business?
Maybe worth considering having confidence to set up some business of your own, instead of thinking that store work is your only option.
I was self employed for 10 years and due to go into another new self employed career this week. I find it hard to work for someone else, and prefer to be my own boss, as I have self motivation and all the good aspie traits. Maybe you have some good aspie traits that you can use to make a success of some career for yourself.
good luck with whatever you decide to do. I hope it works out for you.