Banned for thinking it was me... t'was her husband, who is away on business a lot and couldn't afford to pay a gatekeeper.
Sort of like when King Arthur went away to war and put one on Guinivere, leaving Lancelot behind to protect the realm... and his queen. As Arthur was about to leave the castle he gave Lancelot the key for safe keeping, just in case he lost it on the battlefield. Anyway, after about 15 minutes Lancelot was on his trusty steed and was galloping at full tilt to catch up with Arthur.
"Sire, sire, I think you left me the wrong key."