Requested data cannot be store inside variable in Java

I am trying getting data from an API using volley. I am trying to store it as a global variable, but it always returns null. Why?

Here is my sample code:

JsonObjectRequest jsonRequest = new JsonObjectRequest
            (Request.Method.GET, url, null, response -> {

                try {
                    if (response.getString("action").equals("success")) {

                        checkInTime = response.getString("checkin");
                        checkOutTime = response.getString("chekout");

                        System.out.println(response);


                    }
                } catch (JSONException e) {
                    e.printStackTrace();
                }


            }, Throwable::printStackTrace);

    Volley.newRequestQueue(MainActivity.this).add(jsonRequest);

What is the problem here?

here is my api json response

{"action":"success","checkin":"08:30:25","chekout":"blank"}

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