I have similar problem.
When I locked the door., the motor seemed to have turned few extra rounds, and when I tried to unlock the door, the number of motor turns couldn't make up the excess lock and now I'm locked out from my home!
I also tried to recalibrate the lock but since I couldn't turn the knob from outside now it's asking me to set up the lock. Now I cannot do anything about it.
That's just wrong that theres no back door control for such mechanical failure.