I tried to hold down my power button and volume-up button, still nothing is working. should I take it in?

What are you trying to accomplish?

That is not how you force a reboot.

You need to quickly press and release volume up, then volume down, then press and hold the side button until you see the Apple logo.

The key information here is to quickly push the volume up and volume buttons individually and then hold the on of button until the apple emblem comes on, it may take about 8-10 seconds.

Yes, if a forced restart is not working and your phone is still frozen, you should set up your device for service