On a practical note, if you do want to play with dd locks, now or later, I can recommend to buy the cheapo chinese picks. They are so cheap that they fit in most budgets. They are fun to experiment with as it doesn't matter if one gets destroyed in the process. They do require some modification to work. I recommend the videos on youtube like this
https://m.youtube.com/watch?v=oiNNoHlA4VcThese will not open all dd locks, but you have a good change with the very cheap ones and it's fun, of course. I made functional replacement tips very easily by hammering a split pin into shape. There are many interesting modifications to play with.
To take them to the next level in the future, I can recommend buying plastic mold ejector rods of 2mm as they allow you to shape very nice pick tips with little effort cheaply. You need to drill out the cheapo picks with a 2mm drill in that case but it improves the quality a lot.
Another step up would be the sparrows dd pick or a proper home made one like this
https://m.youtube.com/watch?v=RXH0pAFfU6wWhatever you decide, have fun with this hobby.