Front Seat Belt Buckle Assembly problems of the 2001 Nissan Quest

I put the driver's side seat belt on and can not get it off, it's stuck. I can not get out of my seat belt. It will not unbuckle. I had to wiggle out of it to exit the vehicle. If I were in a wreck I would've died in that seat belt. I still cannot unbuckle it. I have to slip into the shoulder part to even drive the vehicle. My auto mechanic told me that something was wrong with the spring inside the little mechanism that holds and/or releases the seat belt buckle. He said he wasn't touching it. He said to take it to the dealership. I will do that tomorrow. Below, I am asked to list the number of failures, I put one but it is ongoing. In other words, it has failed everytime I have tried to unbuckle it. It's simply stuck and will not come undone.