Unfortunately for your keys, you're still screwed until you get products like Tile. For the phone, however, if you are signed in with your Google account to your Android device, you can ask where your phone is.
So... I went on my own to this little tiny pop-up donut shop. It was this event that showed up on my newsfeed that made me want to go. I'm rarely out, so I thought of giving it a while and check out the scene of my favorite company.
It helps me locate my phone, and set reminders. However, what I would like as an added setting is to disable the my Nexus 6's "Hey Google" when the Google Home Mini is in proximity because sometimes both devices trigger.
Read more for the video that determines your prize.