@jytug71kv4zrzki, No, the paper clip isn't going to work because there's no reset switch hidden inside the input jack. Oontz itself offers instructions on how to reset the speaker.
First:
=== Resetting Your OontZ Angle 3 ===
''Note: The reset function only applies to speakers purchased after Sept 1, 2016''
***Step 1***: Remove the Micro USB charging cable and 3.5mm Audio cable, if connected
***Step 2***: Press and hold down the ***Power button*** and ***+*** button together for 1 second, then release.
***Step 3***: The speaker has now been reset and can turn it on.
Note that the Angle 3 ULTRA has a different procedure; for that model you hold down the power button for 8 seconds.