If someone is trying to force your house door open and you shoot them through your door count on being locked up. Now if they entered your house and you retreated to bedroom and they attempted to enter and you shot through door you should be ok. If it's a nice sunny day and some crackhead opens your unlocked screen door walks in smiles and snags your tv you can not legally shoot him. Now if that screen door was locked you could or if he was to growl and bark at you or have a screw driver in his hand then you're ok. If your car is in your driveway with the keys in the ignition and some crackhead jumps in and is driving off you can not shoot him but if you run in the path of the car you could be afraid he was going to run you over and shoot him.