If you are locked out of your phone's screen, Sony recommends two official recovery methods rather than a downloadable "unlocker":
Here’s a solid, clear, and helpful forum-style post for anyone looking to download and use the (commonly used for bootloader unlocking on Xperia devices). sony unlock tool download
When users search for “Sony unlock tool download,” they often land on third-party websites offering paid software. These include: If you are locked out of your phone's