Trailer Brakes Locked Up

[AJC]

Towed my V20 home from her winter storage spot Monday night and noticed a small amount of smoke coming out between the wheel and the frame of the trailer. I greased the hubs up before I drove it home. It was the front axle of my dual axle trailer. When I pulled over to check it, the hub was hot and it smelled like something was burning. I tried backing up to release the brake but I am still hearing a grinding noise coming from the wheel. I imagine it must of seized up while in storage over the winter. Is there a way to unlock this brake? It is a 97 Venture dual axle trailer for a 21' boat. The brakes are not electric. Any help would be greatly appreciated!