LPT: Stop dead in your tracks and people suddenly notice they’re in your way.
Its an unspoken social etiquette that we all putter along, shuffling our feet and pretending the person in front of us in the grocery isle or queuing for the restroom in a crowd isn’t in our way. If you come to a dead stop, angled in the direction you wish you could proceed and gaze dead ahead, people suddenly notice you. The have always seen you out of the corner of their eye. but it’s only when you’re a completely stationary human being that you appear on their radar and a different social etiquette kicks in.
EDIT: I should clarify that this is 2-3 second move. And is meant to be a less aggressive option to “excuse me” in scenarios where people are taking unnecessary space. Oh well!