I am also autistic and I have social anxiety. I have a great job in the receiving department of a retail store. Zero customer interaction. You are just working with a few other people but you still have your own little area. They expect very little out of you and with my retail experience it is a breeze taking a few days or a week off to go on vacation. This type of job is really all I can do with my lack of social skills and general anxiety.

And there are many, many stores with open positions in their receiving departments.