I dont' know about the one entrance...but I think so.
At this time of year, you might just leave them be. They are pretty much done raising brood for the year, and the workers are basically cut loose to do whatever they want before they die, that is why they are all over sweet stuff this time of year, nothing else to do but enjoy enjoy themselves.
Although if you want to get rid of those foragers....
They don't re-use nests (although cavities?) year to year so they probably won't be back there next year.