Welcome to the SimpleMaya community.

Well you could use "light reduction" to get a nice feeling to it, and put on shadows and make a "door"(a square plane would do) and just put the light behind the door to make the light.

Perhaps you should add some light fog to make it look a bit "dusty in the air" I dont know the english name for it.

And perhaps you will need to do some filling lights. Well, good luck.