Elantra,I replaced the brake light switch. Gear lever unlocked because it had locked. Now the brakes feel hard.

The gear lever had locked. It would not go from drive to park to reverse. We did the brake release button and drove it home. Brake lights were not working so I diagnosed it with the brake light switch replacement. I replaced it and everything went well. Then as we drove the car, the brake felt hard and there was a rubbery smell. The car feels heavy, almost like when the emergency brake is on. What can be wrong with the brakes? Could I have accidentally locked the brakes when I replaced brake light switch?