Block bots from directory

Hello, I know I can use robots.txt but I'd like to mess with a more immediate solution. I tried something like this, but then when I went to view it in browser, it gave 404 so I think my code is wrong. I placed this in the server block in /etc/nginx/sites-enabled/example.com.

# Block some bots from everything in this directory
location = /schedule/ {
    if ($http_user_agent ~* "Googlebot|bingbot") {
         return 403;
    } 
}