to open the door in the work room is easy.
you have to get into the girls bedroom throught the back of the gingerbread house. then click on the poster on the wall.
it will fall down and there will be a seven digit number on the back of it.
that is the number you need to use on the phione to open the door in the work room. trust me its so frustrating trying to play this game without any help i had a b**ch of a time on my first go through it.