2000 Chevy Impala

take a hacksaw blade (or a fine-tooth coping saw blade) and grind down the non-tooth side about one inch in until the thickness of the blade is about 1/16". Slide the blade in the ignition under the broken key. When you pull back, the teeth on the blade will grab the teeth on the key and pull the broken piece out. Another great invention is the fish hook. Take a hook and straighten it, leaving the barb on the hook. Then insert the hook into the lock and using the barb on the end of the hook, pull the key out.