Need to adjust volume from the lock screen

Use case example, very common for everyone:

-Scrolling through Instagram at work.

-All of a sudden one of the posts or stories has volume

-Being at work I immediately press the display off button on the right side

*Problem here*

-I need to turn the volume off somehow before I slide up and get back to the application

-iPhone doesn't let you adjust the volume with the sliders unless it's playing music, or you're not in the lock screen.

-So I have to go BACK to the LOUD application and slide up immediately before any more sound is played, or do a hard reset on my phone.

LET ME ADJUST VOLUME THROUGH THE LOCK SCREEN. OF APPLICATIONS TOO.