Lighting and Door Problems

[Pandemoneus]

Turn grid snapping off and drag the box a bit larger, but I would recommend using a point light for one room.
To make a locked door, click the door, go to the second tab and check locked. There is a tutorial how to make locked doors + keys on the wiki, check it.

[edit]
Here's the direct link: http://amnesia.treesoft.dk/tutorials/Tutorial1.wmv