I took a free trip on CA-125 on one occasion, because the machine was malfunctioning, there was no one around to take my cash, and the onramp was designed in such a way that it was impossible to make a U-turn. I did not get any tickets.
Realistically, if you go through the booth without paying because it’s offline, you can’t get a ticket because there’s no record of you ever passing through there. Such record could only be generated by the booth itself.