No, you should never put a knife or any metal object into a toaster. Inserting metal objects into a toaster is extremely dangerous and can lead to severe electric shocks, burns, and even cause a fire.
Toasters are designed to work with bread or other food items that are safe for toasting. The heating elements inside the toaster can reach very high temperatures, and when a metal object comes into contact with these hot elements, it can cause a short circuit, leading to potentially hazardous situations.
If your toaster is not working correctly or if there is something stuck inside it, unplug the toaster and let it cool down completely. Then, you can carefully use non-metallic objects like wooden or plastic tongs to remove any debris or stuck food items.
Always prioritize safety when using household appliances. Never insert any metal objects, including knives, forks, or spoons, into a toaster or any other electrical appliance.