I've had this problem with the 12" macbook. A speck of dust broke the shift key within 3 weeks, so I got a full refund since it was covered under the Australian Consumer Laws 30 day return policy, since Apple won't admit the structural fault in their new butterfly style keyboards.

I then got the 13" macbook pro 2016 with a "new and improved" butterfly keyboard to have the same thing happen 2 weeks after purchase. Returned it again, got another one.

I'm just going to repeat this process every 30 days until the next model is released, hopefully then the newer model won't be so susceptible to flecks of household dust.

Or I start using my macbooks in a hermetically sealed room with a cryovac suit on.

Here is a conversation with Applecare about the problem that Apple refuses to identify when you go in store with stuck keys:

https://www.4shared.com/music/8YeBZN75ca...?