I want to relock bootloader for my asus zenfone max pro m2

Hello, yesterday I unlocked bootloader with the help unlock application from asus official website. Now I want to relock that , but I don't know how to do it. Can you please help me.
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Hi, we suggest you to please visit the nearest ASUS service center for better assistance. Locate here : https://www.asus.com/in/support/Service-Center/India