help to unlock

If you are locked out of your Apple ID account you can go to https://iforgot.apple.com

This will provide you with the recovery steps you put in place for this situation.

Here are some support articles that should help:

If you forgot your Apple ID password - Apple Support

If you forgot the answers to your Apple ID security questions - Apple Support

If your Apple ID has been locked or disabled – Apple Support

Is the phone activation locked. If yes, see Turn off Activation Lock https://support.apple.com/en-us/HT201441. 

Since you acquired your device second hand form an individual, you will need to obtain the needed password from the prior owner or have the prior owner sign out of iCloud; erase the device; and remove it from their device list. Alternatively, if the person you acquired the device from has their original purchase receipt for the device from an authorized Apple seller with the device’s serial number on it, then they may be able to persuade Apple support to remove the activation lock. Use the support options below. Alternatively, if an Apple Store is open in your area, they can go there to deal with the problem. In this case, they can make a genius-bar appointment (https://www.apple.com/retail/geniusbar/) if desired. If none of the above work, then the device is

useless to you.

Apple ID Support https://support.apple.com/apple-id

Apple Support Twitterhttps://twitter.com/AppleSupport

Apple ID account security for country-specific andregion-specific help https://support.apple.com/en-us/HT204169

Get Support: We’re here to help https://getsupport.apple.com/. Go through the options to find the best support option.

See Also: https://support.apple.com/en-us/HT201365