How to regain Gmail account that is been temporary locked out

Your account will be temporarily locked in 24 hours if Google discovers extraordinary actions to breach security and hacking
You can still try this option to get back as soon as possible:

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Remove settings from any POP and IMAP email client software.
Close multiple instances of the browser to the Gmail login.
Revoke access to all third party applications and software.
Clear your browser's cache and reopen.
Related: Send large attachments through Gmail, Yahoo and Outlook
Meanwhile, if you are using any Chrome or Firefox extensions have a Google account to access, they must be disabled temporarily until your account is re-activated. If you are again locked after enabling extensions, then you must remove permanently extended but because it might be the culprit.

You need to know the reason locked to avoid next time:
The reason behind locked
Receiving, deleting, or downloading large amounts of mail via POP or IMAP in a short period of time.
Send bulk messages to many people at once.
Sign in to sync email or Gmail on many computers, clients, or mobile devices simultaneously.
It could be because of problems related browser. If it finds your browser continually reloading while attempting to access your Inbox, it's probably a browser issue, and it may be necessary to clear your cache and browser cookies yours.
Providing access to file-sharing, file-storage software, email, Analytics services, browser extensions, or third party software that automatically logs in to your Gmail account and perform suspicious.
Related: email access Gmail in Android smartphone using applications
How to unlock your Gmail account quickly?
The only way to unlock it, by waiting a while at least an hour-or something. Personally I have my Gmail accounts unlocked for an hour. But it is believed Google's support team that it could take 24 hours to unlock your account.



For users of Google Apps, you must contact your administrator to unlock your account.
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