How to auto close newsletter popup in shopify after 10-15 seconds?

Trigger a click of .jsclosepoup after a 15 seconds timeout.

Add this javascript snippet at the end of your code file:

{% javascript %}
  function closePopup() {
    $('.jsclosepoup').click()
  }

  var closePopupDelay = 15 * 1000
  setTimeout(closePopup, closePopupDelay)
{% endjavascript %}