It can be part of a safety or operating arrangement. Defeating it changes the conditions the manufacturer intended and exposes you to hot or electrical parts.
What the observation means
A grill that operates only when the door is manipulated may need adjustment or repair, but that is not an owner workaround. The required door position is model specific.
A useful next step
Stop using the affected function and report the behaviour. Do not tape, wedge or bridge the switch. Provide the cooker model and whether the door closes normally so the assessment addresses the mechanism rather than simply replacing an assumed element.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.