How do I recover a locked MacBook Air (Model A1932) after multiple failed password attempts?

Try this

1. Start up from macOS Recovery.
2. While starting up from Recovery, you're asked to select a user you know the password for. Click "Forgot all passwords?".
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5. Follow the onscreen instructions, which vary based on your Mac setup. These instructions might include steps to reset your password.
6. When done, click Exit to Recovery. 
7. You're in Recovery when you see options to restore from Time Machine, reinstall macOS, and more.

• • If you were asked to reset your password, you can now choose Restart from the Apple menu , then log in with your new password. 
  • If you were not asked to reset your password, choose Terminal from the Utilities menu in the menu bar. Or press Shift-Command-T to open Terminal.

1. In the Terminal window that opens, type resetpassword, then press Return. 
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3. In the window that opens, choose a reset option, such as "I forgot my password" or "My password doesn't work when logging in." Then click Next and follow the onscreen instructions.
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6. After you provide the information requested, you're asked to create a new password for your account and any other user accounts. You can then restart your Mac and log in with the new password.

If you couldn’t use these steps to reset your password, learn what to do if you can’t reset your login password.

If you forgot your Mac login password - Apple Support