Doors should be locked, home owners should be aggressive, and danger should be associated with every uninvited entry a party makes.
This. I always hated in BG1 that you could enter 99% of the houses uninvited and there would be no consequences, no guards, no one told you to get the hell out. It's like:''Hi! I'm just exploring to see if there's anything to loot, don't mind me :)''
