Keyholding by black dom?

Good luck. Why would you ever be let out?
I've thought about that and imagined being in that position. I would hope to be let out for a little bit if I did an extra special job of sucking my masters cock or licking his ass, balls and cock clean. Maybe he would find it entertaining to have me beg to jerk off and then make me lick up my own cum before he locks me up again.