With keyless entry standard, I suspect one keyhole on the driver's side
is a sufficient backup. Last year a friend with a high-end Mercedes
faced a significant puzzle when his battery died with the Mercedes
pulled into his garage. Apparently, there was no publically available
way to unlock the car and open it with a dead battery. I remember him
saying the car could not even be towed out of the garage to visit the
dealer (in Park of course). Eventually a mechanic from the dealership
visited and used a back door method to enter the car. Now I suspect
that car has at least one keyhold, but the locking mechanism would not
function without electrons. Wow.