You can use that and adjust the time you want to launch 1= onload 2000= 2 sec
$(document).ready(function(){
$('#click').click(function(){
alert('button clicked');
});
// set time out 2 sec
setTimeout(function(){
$('#click').trigger('click');
}, 2000);
});.container{
padding-top:50px;
}<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="container">
<div class="col text-center">
<button id="click" class="btn btn-danger">Jquery Auto Click</button>
</div>
</div>