This sort of thing just doesn't work on the London Underground gates. They are really "doors" rather than gates, and they're designed to open in the direction of travel, so that the person who has put in a valid ticket and they spring open out of the way, but if someone tries to follow, they spring shut again, catching them, like a mousetrap. The one thing that can catch them out is that if you enter an invalid ticket it spits it out the top without opening the gates. The person following won't realise and will enter their ticket, letting you through.
One thing that annoys me about the IE gates is the slight delay before they open, which means you can't enter your ticket and keep going without breaking stride, which you can with the (much older) LU ones.
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