s13 power door lock problem

[240Zfunahollic]

First off, I'm sorry if this issue has been covered. I have searched and haven't seen this particular problem. When I push my driver lock to lock both doors the lock "thrashes" back at me and wont lock the doors. If I push it hard past the resistance it will only lock the driver door. However if I let it pulse on the kick back for a second and push it slowly past it will lock both doors. That being said I cant lock the doors with the key from the outside of the car. Is this as simple as replacing the door lock timer?