iCloud lock please unclock

what do you mean by 'iCloud lock'?

How to remove Activation Lock - Apple Support

If your Apple ID is locked or disabled - Apple Support

If a message says 'Your account has been disabled in the App Store and iTunes' - Apple Support

Only the owner of the account used to lock it can remove the activation lock.

It's an anti-theft feature.

Have you forgotten your Apple ID?, check your Apple ID via your email box, see this Apple article: If you forgot your Apple ID

https://support.apple.com/en-us/HT201354                  

OR see -> Having trouble signing in?

https://iforgot.apple.com/password/verify/appleid

See also this Apple article: If your Apple ID is locked or disabled

https://support.apple.com/en-ca/HT204106

See this Apple article: If you can't connect or sign in to iCloud

https://support.apple.com/en-us/HT203512