How can I reset the Pin I am asked to access the lock to open or close from the Google assistant?
You can do that using the Nest app.
How to set or change passcodes for Nest Secure and the Nest × Yale Lock - Google Nest Help
How to change Nest × Yale Lock's settings with the app - Google Nest Help
Checking in — have you tried the steps in the articles suggested by davidking? If so, how did it go? Let me know if you need more help.
I appreciate the help here, davidking.
I just wanted to follow up to see if you still need help. Please let us know as we would be happy to answer any questions you may have.
Just checking in to make sure that you saw my response. Please let me know if you have any other questions or concerns as I will be locking this in 24 hours.
Google Nest Help Center
Chromecast Help Center