Used to be universal here too ; not sure when it stopped , but a while back .I’ve seen this in the US; some older petrol stations there have slow old pumps and when the typical family truck / SUV takes 30-35 gallons at a time it does take a while. So the pins are provided in the handle and people use them to shop while they fill.
Probably about the same time attended service was phased out as they probably didn't trust the public with pumps locked on