I used to get out of class at 10:45 pm every night... usually my latest classes were profiling techniques and Serial offenders. Real pleasant topics to study before walking to your car. Pepper Spray is easy to buy, just don't make the common (and cops do it all the time) mistake of spraying it and then running into the spray. You end up choking yourself! Plus, depending on your campus, maybe you can team up with others in your class to go to your car, too. We would all walk to one car and then the driver would take us to our individual cars.

Good luck and stay safe!