Master Lock 5400D Select Access Key Storage Security Lock

I have bought two of these, and both lock boxes failed within about a year's time. One will not open, and the other will not close. I use them to store my spare keys in case I get locked out, so they rarely get used, and yet they still fail. In case you are wondering, I hang them on an interior door (I own a condo), so they are NOT exposed to the weather. Other people have reported similar experiences. It is a piece of junk.