Im a mommy of an isolated aspie

I have a 17 almost 18 year old son,  he is smart,  funny,  and kind.  He also goes selectively mute when in public,  and has 0 communication skills outside our home.  I had to start home schooling him in 6th grade because of anxiety,  and now he wants to work,  but will not leave the house much,  or talk to people,  and I'm not sure where to take him for interview training,  and small social skills.  Ideas??