If you do this you're a jerk. They've already started the process of cleaning the kitchen because they want to leave at close like you want to leave at 5. Do you start something new at 4:45 or do you pack up? If you do this and really believe it's "making people do their jobs" you've graduated to asshole and they're treating you in kind. I understand that HN is full of people who either don't grok cultural norms or who balk at them saying "well if they don't want to serve you half an hour before close they should close a half hour early then." I'm not gonna tell you can't live your life that way but you can't be surprised when you eventually find yourself disrespecting someone by ignoring those norms and people getting angry at you for it.