Just use mechanical door handles. Just Use Mechanical Door Handles. JUST USE MECHANICAL DOOR HANDLES

https://www.theautopian.com/ford-just-recalled-every-mustang-mach-e-because-a-dead-battery-might-not-let-you-back-into-your-car-once-you-leave/

@jalefkowit don't all car fobs have a mechancal key inside? or is that just the ones I know?
@acm_redfox @jalefkowit It's not the lock (though it's also the lock). It's that some cars have flush door handles that need the car to be powered on before you can use them to pull the door open.
@rupert @jalefkowit holy crap! that's just... unnecessary!