Car door locks are extremely finicky

The doors of my car are extremely finicky. Sometimes they work and sometimes they don't. Even when the doors are unlocked, sometimes they wont open from the outside, sometimes they wont open from the inside, and sometimes they wont open at all. I've discovered that after driving, the doors lock by themselves, and the doors stop working sometimes. Something I was able to figure out was that when I am locked out, if I open and close the trunk the doors sometimes start working again.