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”.
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”.