I'm going to ask my friend to stand in a long line to get food for me
You can't get the food yourself?
He's offering me stuff no matter what
It is nice of  your friend to offer to get you things but you shouldn't pester him. He will get tired and not want to even offer anymore.
I don't care, for now I'm getting food for me. I'll wait in line for my turn afterwards
Why not do it now yourself and don't ask your friend to wait in line for you. You don't have anything better to do at this moment.