Idk if darkrp uses the sandbox one, but heres the spawn one sort of, i also dont know the darkrp code to check jobs, so replace "Getdarkrpjob" with that
hook.Add("PlayerSpawnSENT", "SandboxDisabler", function(ply, class) if ply:Getdarkrpjob() == "whatiwannaforbid" then return false end end)