Delete session in laravel

I am using a session_variable as the user_id to get information about the user by querying with the help of the variable. Whenever my user logs in with correct credentials, I create a session variable using:

\Session::put('user_id', $user_id);

And now I have a condition when the user logs out from the website,so how do I remove the session variable from the session using laravel. I tried something like : session()->forget('some_data'); which didn't seem to work for me so what should I do to remove all the session variable I have in the webpage?

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