use AuthenticatesUsers;
protected $redirectTo = '/';
public function __construct()
{
    $this->middleware('guest')->except('logout');
}
public function guard()
{
    return Auth::guard('customer');
}
public function login(Request $request)
{
    $rememberMe = $request->remember ? true : false;
    $customer = Customer::where(['phone' => $request->phone, 'password' => $request->pin])->first();

    if (!empty($customer)) {
        Auth::guard('customer')->login($customer, $rememberMe);

        return redirect()->intended('landing_page');
    }

    return back()->withInput()->withErrors(['Invalid Credential!']);
}