We could really really use a new jail system. This one is not effective at all. Players should not simply be allowed to get jailed then go afk until their time is up.
I've created a temporary solution I plan on implementing in the future that requires players to use their pack key on a stool that spawns once a minute. If they don't activate a stool, nothing will happen and they can sit there all day and night for a year. Once they do activate it, it will spawn another stool one minute later. Stools continue spawning and the script tracks each stool until it arrives at the number set by the admin when the player was first jailed.
A randomly moving 'jailbot' in the room with the player and the stools spawning in one of three random locations makes an afk script near impossible to use.
Using a system similar to this means we can have shorter jail times and the players can afk all they want, they still have to carry out their punishment to get out of jail.