My Apple ID has been locked

That appears to be a legitimate notification from Apple.

For a message saying your Apple ID is locked or disabled "for security reasons", the support article If your Apple ID is locked or disabled - Apple Support directs you to reset your password as outlined in this article ➞ If you forgot your Apple ID password - Apple Support

If you use two-factor authentication and can’t sign in or reset your password, you can regain access after an account recovery waiting period, as outlined in this document: How to use account recovery when you can’t reset your Apple ID password - Apple Support More detail in —> Activation Lockout Issues - Apple Community

Might you have a question?

Proceed as instructed in your screenshot.

Describe exactly what you were doing before this screen appeared and what happens if you restart your iPhone. This could be a phishing attempt to obtain your information.