Normally, you should have TWO keys, one for the ignition & doors, and another for the console & glove box. That's how Studebaker did it, and your car is a '70, so should be the same.
Many times the ignition switch fails and is replaced. That's how a car becomes a three-key car.
The door panels can be removed easily.
Perhaps a locksmith can reset the door lock cylinders to match the ign key. Or, at least, he can make a key for the door locks. May have to look online these days for locksmith services.
--Dwight