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I might just be being dim, but I can't work out how to open the door on 1-1.

The key has to touch the door physically while you're not holding it.

Hmmm... I'm still not getting it.
When I'm holding the key I can't drop it if it's intersecting the door, and I can't push it if I'm not holding it. 
I managed to do it one time - by jumping in the air, releasing the key, moving to the side, and jumping again to hit the key in mid air and knock it into the door - but is that really how you're supposed to use keys?! And then I fell off the edge of the platform and the level restarted and I never managed to repeat my jumping trick. This game may be too hard, maybe? Maybe not, heaven knows I'm no hardcore gamer, but it's a shame I haven't managed to get any further because the mechanics seemed super interesting, more than many of these games (mine included).

The way I do it is that I simply let go of the key while I'm moving towards the door; the key retains my momentum and it hits the door, unlocking it.