Task System - Lock Workstation
The Lock workstation Task locks the local computer. No settings are required.

Credentials
To control a remote computer you may need to use a Credential. The Credential must match the user name and password of the user that you want to login for. Select a Credential in the combo box or click the Settings icon to open Manage credentials in order to add or edit Credentials.
Lock settings
No additional settings are required. The task locks the local workstation where VisualCron is running.