As someone pretty familiar with the judicial/criminal procedure...
They should probably be able to plea down to a misdemeanor, pay a fine+fees, and be banned from the country.
Then they should face the UCLA board, which at the very least they should lose any scholarships, with some sort of probation should they ever get in trouble with the law again, immediate expulsion. Kicking them off the team seems logical.
Any incarceratory sentence for a non-violent, dumb criminal act such as this one would seem extreme, especially if they don’t have a criminal record.
If they don’t want to accept a plea bargain or there is no offer (wanting to make an example out of them), then all bets are off.