The author remixed this model.
To release the lock, use a SIM card removal tool or a pin. Push it through either hole whilst lightly pulling on the cable.
I've added two things - a second hole to allow entry of the release tool if the first hole is obscured by a recessed socket. I've added a warning on two sides of the item “DO NOT REMOVE” to further discourage tampering. There are two lock versions in the file; embossed text and inlaid text. In some scenarios the embossed text can be scraped off by the sides of some sockets, so in that event the inlaid text version is recommended.