How do I get into my notes that are locked, if I forgot the password

Franshay wrote:

How do I get into my notes that are locked, if I forgot the password

You don’t. If you can’t remember the password, the notes are unrecoverable. See this for more information.

How to lock notes on your iPhone, iPad, and iPod touch - Apple Support

You can create a new password, but the new password will only work on new notes that you create moving forward.