[AdamJacobMuller]

30 days on a first offense is excessive I think, but, you have the right idea.

First offense == warning (with police response, handcuffs, etc).

Second offense == 24 hours in jail.

You need to not wreck someone's life for a first offense because if you put a relatively poor but otherwise law abiding person in jail for 30 days after the first offense you're going to destroy their life to the point where the only path for them in the future is crime. Scare them enough to the point where they realize "I don't want this life" but put them in a position where they can avoid it.

[gjsman-1000]

I agree, you are right. I would do that, with maybe 30 days and multiplying for the third offense onward because there has to be a point where the consequences get severe (third strike). But that's just my opinion - my point is more that there has to be something, significant, consistently enforced and stores wouldn't feel the need to do things like this.