Did Sampwnd work for you and did it cost or is it a set of tools that can be downloaded?
It always costs about 1/5 to 1/6 of the phone's starting price and it isn't a set of tools - it is someone who has access to said tools who will remote into your computer and will use their set of internal Samsung tools to unlock the bootloader.
In all honesty, it isn't worth it due to you no longer being able to update your phone fully without relocking the bootloader =(. This is why I am staying away from Samsung phones from now on. Their products are good, however, their apps are all loaded with ads and you cannot easily customize the phone to remove said ads as there is no way to effectively unlock the bootloader and therefore root your phone =/.
As you would expect, the phone world is in a crummy state as it seemingly always is for the most part, haha. Samsung has software restrictions (but great hardware - some of which enforces these restrictions); Google has hardware performance issues due to a financial issue from a goofy lawsuit (but they have great looking software layouts and OS interfaces AND they allow you to unlock the bootloader); and Apple is just....well....Apple (we presumably all know their phone problems if we are here on XDA, haha).