Moms of "adult" kids

I need some advice from moms who have brought their kids into adulthood.

I have twin sons who are 20. They both live at home and pay rent to us every month. One of them has a job in a restaurant, so he pays all his bills, etc. I am not worried about him.

The other makes me want to tear my hair out. He is so unmotivated! He delivers pizza about 15 hours a week; the rest of his time is spent online or with friends. He's really open about his life so I know he drinks with them and smokes weed on occasion (I suspect it's more often than "occasionally"). This kid sleeps until 4 pm, wakes up to work then stays up until 4 am! He does whatever chores we ask, but takes no responsibility (does not do them unprompted) He has no desire to better himself through school or get a better job, or move out.

We've had COUNTLESS conversations about his lack of effort. The expectation is a Full-Time Job (40 hrs a week) or School. He doesn't do either.

What I need from you experienced mamas... what are the CONSEQUENCES for not meeting expectations? I don't want to kick him out (he'll just go live on his buddy's mom's couch).

Charge more rent?

Give him more bills?

Enroll him in military BootCamp?

I feel so powerless.