Fridays gig was like that, tiny doorway at the end of the bar to negotiate with big drunk bloke stood there. When you say excuse me he would just lean forward a bit instead of actually moving, trying to get a doublebass past him without knocking the bridge over was fun.
First time I wait for them to move, after that it's a loud cheery "scuse me" as I come barrelling through with the PA.
If they're too thick to work it out after the first ask then they will physically feel why they should move.
The thing is they are a punter and without punters venues won't want bands, so you have to put up with it.