Nginx rewrite http domain to https - nginx

Question

I have two domain names www.example.com and example.com, both need to be redirected to https://www.example.com in nginx, the no-www configuration takes effect, but the www domain configuration does not take effect.
Here is my nginx configuration
server
{
listen 80;
server_name example.com www.example.com;
return 301 https://www.example.com;
}
server
{
listen 443 ssl;
server_name example.com;
ssl_certificate pem;
ssl_certificate_key key;
ssl_session_timeout 5m;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:HIGH:!aNULL:!MD5:!RC4:!DHE;
ssl_prefer_server_ciphers on;
location / {
return 301 https://www.example.com;
}
}
server
{
listen 443 ssl;
server_name www.example.com;
ssl_certificate pem;
ssl_certificate_key key;
ssl_session_timeout 5m;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:HIGH:!aNULL:!MD5:!RC4:!DHE;
ssl_prefer_server_ciphers on;
location / {
proxy_pass http://127.0.0.1:3000;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection 'upgrade';
proxy_set_header Host $host;
proxy_set_header X-Nginx-Proxy true;
proxy_cache_bypass $http_upgrade;
}
rewrite_log on;
access_log /www/wwwlogs/www.example.com.log;
error_log /www/wwwlogs/www.example.com.error.log;
}
Where is the problem?