Activate alarm, ringtone or audio using ADB?
Suggestion of Google find my phone 
worked: Google knows where your phone is, even if you don't.

From another user, you can also do it with ADB:

adb push t.mp3 /sdcard/
adb shell am start -a android.intent.action.VIEW -d file:///sdcard/t.mp3 -t audio/mp3



  (Playing a video file the same way or starting youtube (adb shell am
  start -a android.intent.action.VIEW -d
  https://www.youtube.com/watch\?v\=oVQqmH4ufCQ)) will not produce any
  sound if the device is locked it seems like)