Scheduler doesn't work


How can I enable the scheduler?
I set up a Google calendar and would like to check how it works, so I need to synchronize the calendar, as I understand it is done through the scheduler.
I tried turning on the scheduler but it does not work (no task is being executed)
I use this command sudo crontab -e -u www-data and *** * * * * cd /var/www/suitecrm; php -f cron.php > /dev/null 2>&1**
I use ubuntu 20.04 and PHP version is 7.4. Suitecrm - 7.11.15
I use 777 privileging on suitecrm folder and files and they have www-data:www-data user and groups

By the way, is there a way to manually synchronize a calendar without a scheduler?
But in any case, could you help me please to enable the scheduler correctly?