ERROR 1064 (42000) ... 'ACCOUNT LOCK' at line 1 - mysql

I'm trying to lock one account and doing a simple command:
ALTER USER 'user_name'#'localhost' ACCOUNT LOCK;
And I getting such error:
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'ACCOUNT LOCK' at line 1
What am I doing wrong? Using 5.6.51 MySQL

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MariaDB [employee_info]> SELECT (Price+=Price) from product_Price;
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ERROR 1064 (42000) at line 1: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server

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I am trying to execute this query in MySQL:
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MySQL prompts me with this error message:
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