Here we have a pretty old box. Maybe made around 1850. There was no key with it, so we couldn't see the contents. I imagined the lock wouldn't very complicated, so I took a bit of copper brake pipe and soldered a simple "bit"onto the pipe.
Then I filed the bit down until it fitted the lock. As soon as I could turn the "key" the box opened.
Inside I found a "feather" cut from very thin paper. After I found the key worked I decided to add a "Bow" (handle) by soldering a 1954 copper cent to the pipe.