I'm having trouble with the doorknob on the door that goes from inside my house to the attached garage. I installed a new doorknob (Kwikset brand, exterior) a while ago. It works perfectly if the door is closed gently. But, the door has self-closing hinges, and it tends to slam shut. When it closes too hard, the doorknob sticks and is very hard to turn. My wife and kids sometimes can't open it. I was able to help a bit by adjusting the striker plate, but it's still an issue. (I'm using the striker plate that came with the doorknob.) What should I try next?
Removing the self-closing hinges isn't a good option. I asked a local builder and learned that they're required by code.
Update: I neglected to mention that the house came with some weather stripping all around this door frame. It gets compressed between the door and the frame. I tried to find the right balance in the striker plate position so that I don't have to slam the door to get it to stay closed.