Edit in JSFiddle

$('.top').on('click', function() {
	$parent_box = $(this).closest('.box');
	$parent_box.siblings().find('.bottom').slideUp();
	$parent_box.find('.bottom').slideToggle(1000, 'swing');
});

<div class="container">
  <div class="box">
    <div class="top">
      click me
    </div>
    <div class="bottom">
      door #1
    </div>
  </div>
  <div class="box">
    <div class="top">
      click me
    </div>
    <div class="bottom">
      door #2
    </div>
  </div>
  <div class="box">
    <div class="top">
      click me
    </div>
    <div class="bottom">
      door #3
    </div>
  </div>
</div>

.container .box {
  float: left;
  width: 150px;
  margin: 20px;
}

.container .box .top {
  padding: 12px;
  background-color: blue;
  color: white;
  cursor: pointer;
}

.container .box .bottom {
  padding: 12px;
  background-color: red;
  color: white;
  display: none;
}