I saw this in a lift in Bournemouth and tried very hard to picture myself doing it:I am not sure how you can do this excessively, but clearly it is such a problem here that they need a sign to advise people not to do it.
However, it pales into insignificance with this sign in a Bournemouth car park:
Disabled Must Pay!!!!
How threatening is this? It is the largest text on the sign.
Maybe Bournemouth has decided to take revenge on all those disabled, excessive-door-holding people.