Passport control for US passports:
Place your passport, picture side down, on the glass and hold it there so it’s flat. And don’t move it (this is where most people got goofed up). Keep it pressed on the glass as the little dots show up letting you know it’s being scanned. Then the first gate will open. Take your passport and proceed to the next machine where you will have your face scanned and then that gate will open. Proceed to the person in the little box to get your passport stamped.