What is the end result you are looking for? You haven’t explained that.
If you want fancy animations to showcase your work then that can be done, it takes work and can cost money.
However, if you simply want to be able to open and close doors you can add simple pivot points centered on the hinge.
These pivot points or handles can be place on a layer that you can turn on and off as necessary.
You can even use these handles to create the multiple copies needed to do a scene to scene animation.
