Problem with my local panera is that half the time there aren't any pagers at the touchscreen station, while there's a 3 foot stack of them at the register.
Another problem is that guided access isn't always active on the iPads, meaning you can go to different apps and potentially change settings around. Since most jailbreaks these days are just apps, an attacker could go to safari and download a jailbreak app signed with an enterprise certificate and have a (tethered) exploit potentially stealing anything from panerabread.com passwords to credit cards.
Another problem is that guided access isn't always active on the iPads, meaning you can go to different apps and potentially change settings around. Since most jailbreaks these days are just apps, an attacker could go to safari and download a jailbreak app signed with an enterprise certificate and have a (tethered) exploit potentially stealing anything from panerabread.com passwords to credit cards.