I see it the other way around. Virtually all modern mobile phones can easily do real time facial recognition, and certainly have enough processing power to navigate through a known location. And even being cynical about tracking specific individuals, targeting all humans would be an easy problem to solve in comparison, assuming you’re just trying to sow chaos.

As for the problem of doors, in the film there were specialized drones with shaped charges to blow holes in walls and windows, letting the rest of the swarm inside.