How do you remove the back seat of a 2001 corolla?

I have a Toyota Corolla 2001 LE. The rear seats drop/ fold. However, can not get into the trunk due to the trunk lock mechanism is not working. The key in barrel is horizontal and stuck. Can not turn the key. Because of this the trunk release latch on the floor by the driver side can not release the trunk.

The back seat release knobs are inside the trunk. Some models have them on top of the rear seats inside the car. Hence can not fold and drop the rear seats.

I am unable to get to the release knobs inside the trunk and unable to get to the latches from inside the car.

I have already removed the base seat in the back. I have seen the 3 bolts.

So do I remove those three bolts as mentioned by Martin Thompson or is there anything else I need to do in order to remove the entire back seat frame?

thank you in advance for your help.

Pavlic