Image Crop Not Working

I figured it out. I had to pass the image in as an ID rather than a URL.

<?php
    $image_id = get_field('content_image_1');
    $image_size="home-left-column-block";
    $image_array = wp_get_attachment_image_src($image_id, $image_size);
    $image_url = $image_array[0];
 ?>
 <img src="https://wordpress.stackexchange.com/questions/220603/<?php echo $image_url; ?>" alt="<?php echo the_field('content_block_title_1'); ?>" height="420" width="630">