No, it is not recommended to use a knife or any metal object to remove toast from a toaster. Using a knife can be dangerous as it can cause electrical shock or damage to the toaster, and there is a risk of injury from the knife slipping or accidentally touching the toaster's heating elements.
Instead, it is safer to use non-metallic tools or utensils specifically designed for removing toast or bread from a toaster. Most toasters have a lever or mechanism that allows you to raise the toast for easy retrieval. If your toaster does not have a lever, you can use wooden or silicone tongs to safely remove the toast.
Always prioritize safety when dealing with electrical appliances, and follow the manufacturer's instructions and guidelines provided with your toaster.