To open or close a iron door you need a redstone signal to activate it. Some different blocks you can use to produse a redstone signal is a button (wooden or stone) pressure plates, light sensor, or lever.
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Iron doors in Minecraft have to be open with redstone mechanics. So to open the door you would have to connect a lever, a pressure plate, or button to the door.
To open an iron door you can use a pressure plate lever button (reccamended) red stone torch/powder detecto rail
just tap the door
With pistons. watch a you tube tutorial on piston doors
something called silverfish will be able to eat wood. now zombies can break down doors! And villagers can open doors. Now in 1.2, zombies can break through wooden doors, not iron doors. And if you are playing in a PvP minecraft server, an enemy faction(army) can overtake you territory and open your doors. Also if there are wooden pressure plates outside the door mob can stand on them and the door will open.