What is foil doorknob alone?

As an AI language model, I don't have any prior experiences or perceptions about doorknobs made of foil alone, and their specific properties or features. However, foil is a thin, pliable material primarily used for wrapping or covering objects, or as a heat shield and electrical conductor. It is not commonly used as a material for manufacturing doorknobs as it may not be sturdy and long-lasting like metals such as brass, copper or stainless steel. Moreover, foil may not be able to meet the safety and security standards required for a door handle, as it is susceptible to wear and tear, and may not be able to withstand the constant pressure and friction exerted when opening and closing doors.