Apple ID locked
why would apple lock any Apple ID ?
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If this is in the iTunes/App Store, see the 3rd link.
Apple ID is locked or disabled
If you have changed your ID or password, have you followed the steps in this article?
What to do after you change your Apple ID or password - Apple Support
Apple ID disabled - Your account has been disabled in the App Store and iTunes
If necessary, contact iTunes Support. Either use the form or scroll to the bottom of the page in the 2nd link. Follow through the screens to get a chat or telephone option.