How to open the seat cushion of Guosan suzuki king?

The seat cushion lock of Haojue Suzuki motorcycles and Neptune scooters, if it is the second edition of China, is on the fender at the lower left side of the seat. You can insert the key into the lock and turn it to open the seat cushion. If it is version 3, it is integrated in the front lock. Insert the key into the front lock, do not press it, and twist it directly to the left (with a little spring resistance) to open the seat cushion lock.