If you want to keep it simple, just put a latch accesable from the inside and only use that when you are home and then put a master lock on the outside that you only use when you are away. Master Lock makes a combination lock I really like as an older person that you don't need to wear cheaters to open. The lock has a disc in the middle that slides up, Dow, left, and right. You can program the lock to open in any sequence of four disc slides, a blind person could do it very easy. Then you don't have to carry a key.
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