Realistically, probably the same thing as what happens at self-checkout lines with idiotic anti-theft checks:

A beacon above the kiosk turns on, an attendant walks over and, without a word, flashes a badge at the machine to override the system lockout as they roll their eyes: this is only the hundredth time today someone accidentally pressed the wrong button, because what kind of terrorist would voluntarily press “yes”.

It crashes. Nobody expected that. _/s