MVP
Accordingly the above means (featuring a selection from among US presidents rather than your own cohort) would encode the sequence 1-8-9-4-5-4-5-9 by substituting for the first nine keys on a smartphone's start-up screen.
The advantage of moon-shot projects is that they have a focal point. If it is looking at all feasible, therefore, then you'll see news of progress towards that end right here.
Meanwhile an outline of the quest to replace the conventional screen-lock appears at the URL below. Why publish? Because we need more secure ways of protecting our ID: