It all depends on how long that you stopped working for McDonalds.If they started carrying new stuff, then they might help you out there, but you'll soon get into the swing of things again. Hopefully your store manager is not a smart butt.
If you haven't worked in awhile I am sure they would be glad to refresh your memory. Just ask kindly and I think they'll be glad to help. You are part of the team so im sure they'll want to help you out