Our last volunteer leaves about 1:30 in the morning and our first volunteer arrives at 5:30AM.  What you might try is adjusting your schedule somewhat so that those who work 8-5 can come from work and volunteer.  Some of the early morning volunteers come on their way to work.

The large majority of our adult volunteers hold a full time job. You have to be flexible and creative in scheduling but they are willing to volunteer as well--and we do require a three hour block of time.  I might tell you that our average age of our volunteers is 30.

Certainly college students are a good recruitment pool for after 3 positions.