I've never seen this happen before, it's either people holding the door or giving it a little push so it stays open longer.
Heck I've never seen someone not do one of the two things above, expect if it's a door that you can't easily push back with little strength (like those doors made to close by themselves).
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Best LPer ever, Gix ! : http://www.youtube.com/watch?v=Vt5YKmP7ecY