In Magento 2, when a user enters incorrect login credentials multiple times within a certain time frame, their account can become locked for security reasons. The locked information for users is stored in the oauth_token_request_log table in the Magento 2 SQL Database. This table keeps track of OAuth token requests, including failed login attempts. To unlock a locked user in Magento 2, you need to follow these steps:

• Access your Magento 2 database: First, you need access to your Magento 2 database. This can typically be done through phpMyAdmin or any other database management tool provided by your hosting provider.
• Locate the oauth_token_request_log table: Once you’re inside the database, locate the oauth_token_
  Where does Magento store the user’s locked information, and how to unlock locked users?

  request_log table. This table contains information about failed login attempts and includes the customer email associated with each request.

• Find the locked user’s email: Search for the customer email whose account has been locked due to multiple failed login attempts. Identify the corresponding row in the oauth_token_request_log table.
• Delete the row: To unlock the user, simply delete the row associated with the locked account from the oauth_token_request_log table. This can be done with a simple SQL query executed within your database management tool.

It’s important to note that directly modifying the database can be risky, and you should always take a backup of your database before making any changes. Additionally, if you’re not comfortable with database operations, it’s recommended to seek assistance from a qualified developer or Magento expert to ensure the process is done correctly and safely.