A traditional sliding deadbolt[1], which cannot be locked while the door is open since the tongue will prevent the door from closing completely, takes very little force to operate (for those arguing that this overly complex design is "because accessibility"), and can be combined with a switch to prevent the power operated mechanism from attempting to move the door if the lock isn't all the way open (i.e. the switch actuates before the tongue protrudes.)
But in this case they clearly attempted to complicate things as much as possible, so no surprise that additional edge-case bugs and points of failure were also introduced.