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So I am assuming either the battery is dead or disconnected or loose? If them door locks are electric and that is why they are not unlocking, I assume you could hook a battery charger up at the starter positive post and even if the battery is disconnected, hopefully the charger will still be able to unlock the door, that is assuming the circuit does make a path to it while not having to be via the battery.
I'll see if I can confirm that in a wiring diagram.