No. Spraying oil or cleaner behind the control is not an appropriate owner repair. A gas control needs suitable assessment.
What the observation means
Stiffness may concern the knob, valve or another part, and force can make the situation worse. A control that cannot reliably reach Off is an immediate concern.
A useful next step
Stop using the affected appliance and obtain appropriate gas advice. If gas is smelled, follow emergency guidance rather than attempting adjustment. Do not remove the valve, loosen fittings or grip a spindle with tools to restore movement.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.