Hello, friends! Is anyone familiar with policy on early voting for the polling place closing with voters in line?

If people are in line do they have to let you vote? I am in line at the local library and rumored down the line is that they will close the doors at a certain time. If you're in line and not inside the doors, then too bad. Try again later. I am just curious if there are any "rules" to this.

TIA!