Humans could already extort guards like that and -- in the case of ICBMs -- it has not been successful.
Also don't underestimate the psychology of guards: You'll always find people who are either very principled (yes, they do exist) or get a kick out of controlling (imprisoning in this case) someone/something, especially someone/something of a high intelligence.
Throw in a hierarchy with a controlling officer and two subordinates who were also trained to watch the officer and I think it's pretty secure.