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I saw the earlier sentry post with the not sharp knifes and it reminded me of how I used to get into my old safe. I hope this way is more satisfying to the RE community.
The safe I had looked like this
there are a few variations to that style like size and such that still works but as for other sentry key safes I cant know for sure if this work.
Find a swiss army knife that has scissors like such
Pop off the half of the scissors that is not directly attached to the knife
Now just stick the the half thats left using the knife to help hold on into the keyhole. Tilt the knife down, so the scissor piece moves upward should feel something move now turn. Of course the other piece can do the same thing just less to hold on to. Sure you can do this with many other objects like not sharp knifes. But hey you can never go wrong with a swiss army knife