Magento 2 Cron Job In Custom Moudle

1. Create a class to run cron

<?php
namespace Magento\SampleMinimal\Cron;
use \Psr\Log\LoggerInterface;
class Test {
    protected $logger;
    public function __construct(LoggerInterface $logger) {
        $this->logger = $logger;
    }
/**
   * Write to system.log
   *
   * @return void
   */
    public function execute() {
        $this->logger->info('Cron Works');
    }
}

2. Create crontab.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Cron:etc/crontab.xsd">
    <group id="default">
        <job name="custom_cronjob" instance="Magento\SampleMinimal\Cron\Test" method="execute">
            <schedule>* * * * *</schedule>
        </job>
    </group>
</config>

The preceding crontab.xml runs the Magento/SampleMinimal/Cron/Test.php class once per minute, resulting in a row being added to the cron_schedule table.

3. Verify the cron job

php bin/magento cron:run

Reference Link: Configure a custom cron job and cron group (tutorial)