I would not refer to that schedule as training. Its really just riding. Not enough to need a rest day. Perhaps you can add some intervals to your commute either on the way or on the way home. Maybe some hill repeats one day, some sprint drill to follow. Another day can be used for 5 minute max intervals(an effort you can do for 5 minutes, but barely). The racing forum has some training plans/workouts in a sticky. Id start with 2 different ones per week during the week with a regular commute day in between.