If you want to lock a customer programatically, you can perform the following steps.

• You can Lock it directly over the database changing the following fields:
  • Go to customer_entity table.
  • Set failures_num = 10 (something more than 3 which is the max failure number)
  • Set ‘lock_expires’ =  ‘2029-11-06 10:17:50’ (any datetime with something where you know its going to be fair enough, like 10 years later)
  • Go to customer_grid_flat table.
  • Set ‘lock_expires’ as well as on customer_entity table.
• If you need to perform the same thing programatically, you can use the following snippet:
  
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  public function __construct(         \Magento\Customer\Model\ResourceModel\Customer $customerResourceModel     ) {         $this->_customerResourceModel = $customerResourceModel;     }         public function yourLockFunction () { >>>         $this->_customerResourceModel->getConnection()->update(             $this->_customerResourceModel->getTable('customer_entity'),             [                 'failures_num' => 10,                 //'first_failure' => $customerSecure->getData('first_failure'),                 'lock_expires' =>  '2029-11-06 10:17:50',             ],             $this->_customerResourceModel->getConnection()->quoteInto('entity_id = ?', $customer->getId())         ); <<<     }         public function yourUnlockFunction () { >>>                 $this->_customerResourceModel->getConnection()->update(             $this->_customerResourceModel->getTable('customer_entity'),             [                 'failures_num' => 0,                 'lock_expires' =>  null,             ],             $this->_customerResourceModel->getConnection()->quoteInto('entity_id = ?', $customerId)         );             $this->_customerResourceModel->getConnection()->update(             $this->_customerResourceModel->getTable('customer_grid_flat'),             [                 'lock_expires' =>  null,             ],             $this->_customerResourceModel->getConnection()->quoteInto('entity_id = ?', $customerId)         ); <<<     }

  
   

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