I bought a set of lockpicking tools (also known as skeleton keys) that I never carried with me, as the case they came in was too bulky. I've made similar wallet carriers like this before, and saw a perfect opportunity to add my (potentially illegal) set of lockpicking tools in my wallet for an everyday carry.

I recommend using the thinnest paper you can find, and run it through the laminating machine 2 or 3 times if possible, at different angles of entry. The instructions are right on the printout and are very easy to follow. We've also got a similar design for Septa (Bus 22mm) Tokens, and Regular Old House Keys.

I will point out these tools are thin and flimsy, and require a very light touch with a well-practiced hand. At least you can save face by saying you're not unprepared, just unskilled.