2801

I have a 1979 Avanti 2801 and I can't lock or unlock my doors from the outside. I can lock the doors with the lever on the door panel but if I put the key in the lock nothing happens. There are 2 toggle switches on the left side under the dash that lock and unlock each door electrically. Someone told me that the key is supposed to unlock both doors when turned? The lock mech. must be working but the key doesn't do anything? Any help would be appreciated Thank you.