How to restrict the user to login after a bound time period in salesforce?

Hi Naman,

To restrict the user after some specifies time to login in salesforce you should mention the time in Login Hours.

Go to  Setup, enter Profiles in the Quick Find box, then select Profiles.
Select the profile of  user that you want to restrict.
In the profile page,Click the Login Hours Button and mention the time and day when you want the user not able to log in salesforce Org.