Here we have a very compact and useful two-piece set. Each of the pieces serves not only as a tension wrench but also as a rake or feeler pick.  Depending on your style and the type of door lock you are engaging with, will determine which of the two you decide to use. 

This item can be easily secured inside of a wallet, in one's pocket, or any other discrete carry location that you can imagine. The item is high quality and maybe in the United States out of precision stainless steel. 

Makes for a good travel set when going into non permissive environments.