You will need to find a workaround. Here are your options:
* Professional Assistance: The best and safest approach is to call a tow truck or roadside assistance. They have the tools and expertise to handle this situation safely.
* Access the Brake Mechanism (Advanced and Risky): You *might* be able to manually release the parking brake by accessing the rear brake mechanisms. This requires significant mechanical knowledge and the right tools. It's extremely easy to damage something in the process, and it's not recommended unless you are very experienced with vehicle brakes. Improperly doing this could lead to further damage or injury.
* Temporary workaround (If possible & safe): In *some* cases, if the truck is on a slight incline, gently rolling backward *might* release the tension, but only attempt this if you are certain it's safe and won't damage the vehicle or cause harm. This is not a reliable or recommended method.
In short: Don't try to fix it yourself unless you're a skilled mechanic. Call for professional help. It's the safest and most reliable way to resolve this issue.