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I love doing the fake finger bend/flex and making a subtle clicking sound to make people think it's broken.
But, yes, it's depressing the number of people that have leant past me to press the button I'm already pressing because they think I'm not pressing it. A lot of the SWR trains have the indicator light around the button (and a *ding* noise) to let you know when you can press it.
Mostly they don't know that the door doesn't automatically open when the train comes to a stop, but only when the guard has got out, looked along the platform and then pressed their door release button.
I think I've read that the psychological imperative for this is not the hope that the door will open early, but signalling to your fellow travellers that you are on it and aware of your role 🤷🏻♀️