How to release a stuck gas stove knob?
Try pulling the plastic knob off. There should be a metal peg sticking out (the plastic knob fits over it) then try squirting some WD-40 on it and gently grab the metal peg with some pliers and slowly turn it. Don't force it too much as it may break. When it loosens up, replace the peg. I hope this works for you. Good luck.