There are various reasons why you might need to "unlock it." See these possibilities:
See If you see a message that says 'Your account has been disabled in the App Store and iTunes' https://support.apple.com/en-us/HT208856"There might be a problem with the payment method that you have on file. When you see the message, don't try to edit any of your account information. Instead, contact Apple Support for help.”
Use the Apple recommended support link above first.
And, if necessary, go here is how to contact iTunes worldwide support via text or chat using this link https://support.apple.com/choose-country-region/itunes After choosing your country, see the heading Tell us how we can help.
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See this document If your Apple ID is locked or disabled https://support.apple.com/en-us/HT204106 "If you or someone else enters your password, security questions, or other account information incorrectly too many times, your Apple ID automatically locks to protect your security and you can't sign in to any Apple services.”
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See If you forgot the passcode for your iPhone, iPad, or iPod touch, or your device is disabled https://support.apple.com/en-us/HT204306, especially the section entitled Remove your passcode.
If you don't have a computer as mentioned in Remove your passcode, then "borrow one from a friend, or go to an Apple Retail Store or Apple Authorized Service Provider." Of course the last option usually is not available now.
Later the document says: "If you can't update or restore your device using recovery mode, or you can't use recovery mode because of broken or stuck buttons, contact Apple Support. Then follow the steps to set up service for your iPhone, iPad, or iPod touch."
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If your payment method is declined in the App Store or iTunes Store https://support.apple.com/en-us/HT203005
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See Turn off Activation Lock https://support.apple.com/en-us/HT201441If this is your problem and you or someone else erased you device without signing out of iCloud first, then you will be unable to answer the pertinent security questions. For this reason, we will be unable to help you unless you have an extenuating circumstance (e.g., you have the receipt for the purchase of a pertinent device with its serial number on it). If you think you have one, then post back.
