There are methods lock() and unlock() in UIATarget, but they were deprecated and don't seem to work any more (calling them gives undefined function error).
There is lockForDuration() method, but it does not return until screen is unlocked.
If I set a passcode for screen unlock, then after lockForDuration() is returned (of course without being able to unlock the screen), I can dump lock screen elements with logElementTree() function. But at the same time I can't interact with them.
Is there a way to overcome these obstacles?