Let's rule out capital punishment (that's execution) in favor of maybe corporal punishment (physical punishment that inflicts pain).
As for going for the maximum, that would be 1 year in prison and $2500 fine for a first time offense (that is per offense, by the way, so we could be talking 3 years in prison). That is very rarely applied when you are talking about someone around 21 or 22 having a drink with a friend who is 18-20. Heck, Fischer is now 21, so he can buy for himself.
I'm all for following the rules and facing the consequences when I don't, but I can't see 3 years in jail for this. ZZYX, do you really see this as an appropriate 1-3 year prison stay? It will likely result in at least $3,000 in fines, not including legal costs. $1,000 is listed as the minimum fine.