Tony your camera is now over 30 years old. THe fact that this is all that is wrong with it is a blessing. But why are you still shooting film? There is nothing you can do on film that can not be achieved on digital.
If there is a film in the camera, then the interlock will prevent the film being wound on. Can you operate the shutter, or is that locked too ? If you are willing to sacrifice the film in the camera, open the back and remove it, then try again with an empty camera.