Parking brake is stuck?

This is one of a couple reasons, but it all comes down to something is seized.

Either your shoes in the rear have locked to the drum and the release is not actually releasing. Or the other reason is the cable is seized in and not releasing the shoes.

So, we need to remove the rear wheels and pull on the cable and see if you can loosen it or you are going to have to use a hammer on the drums to try and break the seized components.

https://www.2carpros.com/articles/how-to-replace-rear-brake-shoes-and-drums

I am attaching the info below on how to adjust the parking brakes so let's run through this process and go from there. Thanks