As an admin or a training manager, you can set due dates when assigning courses to users. You can also control what happens when a user misses the course due date. You can either choose to auto-unassign the user if the due date is missed or you can lock them out of the course. For more information on how to enter due dates please visit this article.
Once the users are locked out of the course they will be able to access it but they will not be able to launch any lectures inside the course as they will get the following message.
To unlock the course for these learners, select the Team Workspace. Locate the specific individual and course under My Team's Dashboard on the left.
Select the wrench icon next to the individual's name.
Select the unlock button. This will allow the user to access the course steps without any issues from now on.