I really believe that you can. Not only do I think it is a part of public service to help young people find their way, just as professors had helped me find mine, but I've been very involved in K-12 education issues. I started a program back in 1992 called the Center for a New Generation, an afterschool enrichment program.
Film's hard when you don't have any relationship with the director at all and you just show up. Then you really are just a gun for hire.