Require 'www' for https://example.com

I am setting up a server that will be for a B2B business, and I want the whole site to be served as https://www.example.com/

I have gotten a certificate and https://www.example.com runs just fine, but I can't figure out how to require https://www.example.com when a user tries to go to https://example.com.

In reading through the nginx.org site, it seems like rewrites and if statements are discouraged. I did figure out how to require http://www.example.com/ by using the following in my server block file:

server {
listen [::]:80;
server_name example.com *.example.com;
return 301 $scheme://www.example.com$request_uri;
}

But doing something similar for 443 doesn't seem to work.

Can someone please help me out or point to a good page on setting up for this?