J.G.
Time out does not work for all children - and it is often not used correctly. It's not the same as sitting in the corner as punishment - it's a break to regroup and change the behavior. If a child likes time out and acts out to get in the pack and play - then that's not working. If time out escalate to a power struggle, it's not working. If your routine helps diminish the unwanted behavior - then it is working.
The autism component adds to the mix. I would suggest getting Birth to 3 - (in CT) or whatever early intervention program your state has - involved as soon as possible. It can make a really big difference in all aspects of your son's life. They can also help you work out discipline and behavior routines. The best advice I got from my son's Birth to 3 case worker was to stop using time out with him - and especially to stop making it like "sitting in the corner" as punishment. If he needed a break it was to be a very short break - otherwise it became a conflict over staying in time out rather than teaching appropriate behaviors (also, focus on teaching appropriate behavior rather than punishing bad behavior). Sure, it's awkward when my son and another child have a conflict - his buddy will put himself in time out, stay there for several minutes and then talk to his mom about the issue. My son stays for about 45 second to 1 1/2 minutes until he calms down and then I have him engage in physical activities that help him maintain control of himself (the PT suggested 3 somersaults followed by 10 jumps - works wonders for my son's issues). I have to explain to moms that this is what works for my son - I'm sorry for the conflict between the children. My friends now understand and I can't worry about the rest of the people - I need to do what is best for teaching my son in the long run.
Your son's case worker can help you and your son build strategies so he can maintain his composure.
Good luck and know that there are support groups where parents can offer tips on raising a child with Autism spectrum issues.