Depends on what you want to unlock it for … ? If you wish to download videos then you can only download those some that are public - and not all of those. There are a number of online hacks that will do this for you.
If you want to unlock certain features of YouTube then you will need to verify your account - usually by confirming an email address, telephone number and adding certain other details.
If you are trying to unlock a suspended channel. For that I recommend that you: