I'm trying to click the heart button in Instagram dm using javascript.

This is my code

var elem = document.getElementsByClassName("wpO6b").length - 1;
var heartButton = document.getElementsByClassName("wpO6b")[elem];
heartButton.click();

And this is the heart button code

<button class="wpO6b  " type="button">
<div class="QBdPU ">

<svg aria-label="Like" class="_8-yf5 " color="#262626" fill="#262626" height="24" role="img" viewBox="0 0 48 48" width="24">

An image of what happens every time I run my code, actually nothing happens and it doesn't send the button emoji. Help me, please

The button index