It sounds like you have a bad master cylinder or booster. I would loosen the brake master mounting bolts three turns to see if the brakes release. If so, I would install a new brake master. Here is a guide and instructions on how to change the master out in case you need it. This guide may help as well:
https://www.2carpros.com/articles/a-comprehensive-guide-to-fixing-automotive-brakes-locking-up
You will need to bleed the master before installation.
https://youtu.be/WDxvEQrMkBg
Here is a generic guide to help you step by step with instructions in the diagrams below to show you how on your car:
https://www.2carpros.com/articles/how-to-replace-a-brake-master-cylinder
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Thursday, July 13th, 2023 AT 12:20 PM