It is a "difficult" analogy I agree... I'm sure I can come up with something...
Oh, I know, what if the self scan's weren't taking cash - which does happen sometimes!
So I go to the security guard on the door. Does he:
(a) direct me to the cigarette counter to pay?
(b) ask me some hypothetical question about what would I have done if he hadn't been there and charge me £80?
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Here you are: 11Pm at night. No proper tills open and no customer service counter. Just a security guard and a novice employee supervising the self scan.
An item comes up at the wrong price. The customer is asked to pay the higher price and bring their receipt into store next time.