Help with Cron?

I recently installed the APF firewall on my friend's server.

I was told that cPanel would mess up in future if I didn't add the following crontab to run every hour.

service apf stop
/usr/local/cpanel/cpkeyclt
service apf start

I've never had much luck with crontabs, but how would I make those 3 lines run every hour?

So far I have: 0 * * * * ???????????????????

Thanks in advance for your help!

 

 

 

 

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