Doors in sindome are usually attached to things that people want Private, but not always. If you need to key in a code for a door, then you would type it as:
on [direction or place door is attached to] [/b]
and it will give you some form of confirmation that it unlocks. No matter weather or not a door is unlockable or not, the next part remains the same.
Open [room or director door is attatched to] will open the door.
close [room or director door is attatched to] will close the door.
You can check if the door is closed and locked by looking in the direction of the door.
Something like that for Doors?