Auth::logout() removes user's data from current session, it does nothing to other sessions.

So you either need to somehow destroy other user's session, and I'm not sure there's a standard way to do.

Or, alternatively, mark that user for logout (in, say, an additional field in users table), and check that mark in app/Http/Middleware/Authenticate middleware:

	public function handle($request, Closure $next)
	{
		if ( ( $user = $this->auth->getUser() ) && $user->forceLogout) {
			$user->forceLogout = false;
			$user->save();
			$this->auth->logout();
		}
		if ($this->auth->guest())
		{
			if ($request->ajax())
			{
				return response('Unauthorized.', 401);
			}
			else
			{
				return redirect()->guest('auth/login');
			}
		}

		return $next($request);
	}