javascript push

not working

HTML

<p>Click the button to add a new element to the array.</p>

<button onclick="addNewReminder()">Try it</button>

<p id="demo"></p>

JavaScript

function addNewReminder() {
  var newReminder = {
    "method": 'popup',
    "minutes": '20'
  };

  var reminders = [{
    "method": 'popup',
    "minutes": ''
  }, {
    "method": 'email',
    "minutes": '10'
  }];

  reminders = reminders.push(newReminder);
  document.getElementById("demo").innerHTML = reminders;
}