On a 150 the intermediate door shuts if you key out without flicking the local switch first
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I always thought That's because the doors take time to open depending what speed the train is
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For some reason on 158s you can key in and even flick open the local door switch whilst the train is on the move, and the door controls for that door will light up, but the brakes still won't kick in. Not something I've done intentionally obviously, but if the previous guard leaves the local switch open and you don't notice before you key in that's what happens......
But again it's very important to emphasise that without keying in, on a 158/9 nothing will happen to the doors regardless of what buttons you press.
I always thought That's because the doors take time to open depending what speed the train is