most table service restaurants are not set up for take out...I have been in line to check-in at several different restaurants and heard people being told no, we don't do take-out. It's been pretty rare that anyone reports success on this topic (it does come up at least once a week, seems like.)
However, as PP said, doesn't hurt to ask. If it's a slow night, they might be able to accomodate you. Just so you know when you ask you probably will be told no.