How to filter keys of an object with lodash?

I have an object with some keys, and I want to only keep some of the keys with their value?

I tried with filter:

const data = {
  aaa: 111,
  abb: 222,
  bbb: 333
};

const result = _.filter(data, (value, key) => key.startsWith("a"));

console.log(result);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.min.js"></script>

But it prints an array:

[111, 222]

Which is not what I want.

How to do it with lodash? Or something else if lodash is not working?