I had the same problem after my car sat about 8 years while I was away overseas.
I completely drained the entire hydraulic system and used new/fresh brake fluid. I had the drums checked for thickness and then had them turned/machined and they were perfectly round with no warpage.
I then replaced the old shoes and made sure the new shoes were put in the correct positions. The forward facing shoe is different from the rear facing shoe.
Removed and cleaned the adjuster and properly lubed it.
The shoes were then adjusted with the newly cut drums on until there was a very slight drag on the drum as it was rotated. Put the rubber seals back in place and put the wheels back on.
My car has front discs, so I did not have to adjust the front.
Got it back on the road and the lock up problem was gone.
While you have the car with both wheels off the ground, it is a good time to adjust the parking brake.
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