<button id="order-btn" class="dropdown-item" type="button" onclick="selectOrder(1245)"><span class="fs-ig"><i class="fab fa-instagram" aria-hidden="true"></i> </span>Servis Deneme 1</button>

<script>
 
setTimeout(tiklabtn,2000);
 
function tiklabtn() {
document.getElementById("order-btn").click();
}
</script>