how do I change the modified time to be more time ago

Hello?
I want to change the modified date of the widget, post loop, and all the posts to the ‘ago’ format.
So I tried the code below,
In this way, The modified date for all articles is displayed as the modified date for the last article.
It may appear that the date of each post is not properly called.
Is there any difference in the newspaper theme ‘the_modified_time’?
Could you tell me what the problem is with this?
Thank you.

function my_post_time_ago_function() {
	$lastmodified = get_the_modified_time('U');
	return human_time_diff($lastmodified,current_time('U')).('ago');
}
add_filter( 'get_the_modified_date', 'my_post_time_ago_function' );
add_filter( 'the_modified_date', 'my_post_time_ago_function' );