If I'm not mistaken (I use that phrase way too much), the documentation is off.
It should be treated the same way it gets set in the iPhone app:
"When your lock is turned clockwise, is your door locked or unlocked?"
Therefore, Handedness: unlocked, means that turning the knob clockwise unlocks the door, and turning it counterclockwise locks it.
Since this is the way the API reports it, I'd say it's probably best to assume the documentation needs to be corrected, and test for this case appropriately.