Advice on locking door from outside without needing to make huge modifications to a door.

Currently I live on a property with a manager who has a master key and is suspected of entering apartments without notice. Is there anyway I can lock the door when I leave for extended periods from the outside?

I was thinking of maybe a chain setup with a lock so you can open the door part way before the chain stops the door where the gap is too small for a human to go through and then you have to unlock the chain from the gap in order enter. However I can’t find any setup like this for sale.

Does anyone know any lock setups where you can lock it from the outside without drilling any huge holes into the door?

submitted by /u/RandChimp
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