hi, been thinking about getting a keysafe for a while - where you keep a spare (front) door key inside a metal box, with a keycode, for outside our house. I know they seem mostly to be used for elderly people, so visitors/carers can let themselves in. Anyone got any experience -are they really safe i.e. can't get the key out unless you use the correct keycode? and must be much safer than leaving a key under a plant pot which we never do