It's possible that both rear door locks failed, they are that shitty. It's also possible that what they call a bulkhead connector has corrosion in it. The connector has all the door lock circuits in it and its possible the doors are not getting the unlock signal. I say that because if the door lock is in superlock it should come out of superlock with an unlock signal. It was common for them to fail in superlock. If that happened we would pull the belt molding off to gain access, then break the superlock motor off the latch with a long screw driver and a hammer. Once the motor is broken off the latch you can dig around in there with the screw driver and move the mechanism.
It's no fun.