If the crank shaft is in the engine and if the engine is in the car I would put the car up on jack stands ( for safety). Remove the water pump pulley. That will allow you to remove the v-belt easily. Remove the plastic mud shield on the passenger side of the engine. Then remove the crankshaft pulley ( it is probably already off and you are working on the woodruff key that was indexing the crank pully). Make sure that you rotate the engine such that the key is pointing down. Be sure that you stuff a rag in around the snout of the crankshaft such that when the key breaks out of the keyway it cannot fall into the oil pan. The way I have gotten stubborn keys out of keyways was to go after them with a small hammer and punch. I try to worm the punch under the key which will lift the end of the key and make it easier to grasp and remove. Frankly I have never failed to get a key out of a keyway. Generally they are only a slight interference fit.