stopping user to access the system for few days

One of our user is on leave for few days
and I want to stop him accessing the systems for these days ..

should I

        Add * to his encrypted password 

       or delete the user from  etc /password file
       or Remove the user encrypted password
       or rename username to root
       or set his userID to -1

Which option should i go for out of the above

Source: ubuntu

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