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Here is a guide on how to lock a module?
You can set modules to be locked until a given date. Students will be able to see the module titles and module item names, but they will not be able to access the module items until after the lock date has passed.
Open Modules
In Course Navigation, click the Modules link.
Edit Module Settings
Click the Options icon [1]. Select the Edit link [2].
Lock Module
Click the Lock until checkbox.
Set Date
In the Unlock field, enter a date that the module should unlock.
Use Calendar
You can also use the calendar to select a date. Click the Calendar icon [1]. In the calendar, click the date the module should unlock [2]. If you want to set a specific time, enter a time in the time field [3]. Click the Done button [4].
Update Module
Click the Update Module button.
View Module
The unlock date and time will appear next to the bottom of the module.