door locks no working on 2004 Mazda MPV

The driver side and passenger side front doors won't unlock. Both with the key or manually the doors won't unlock, when you hit the unlock button the lock only moves part of the way to unlock, but if you hit the to lock it works fine. If you try to use the key in the door to unlock you will break the key off trying to get it to move in the unlock direction. What would cause the unlock to quit working in the front doors?

Asked by for the 2004 Mazda MPV
Sounds like door lock actuator motors that are sluggish and weak. Even both sides at the same time is possible.