My iPhone stuck

In this case you will need to restore your iPhone to the factory settings:

Step 1: Make sure that you have a computer (Mac or PC)

This process requires a Mac or PC. If you're using a PC, make sure that it has Windows 8 or later, and that iTunes is installed. You also need the cable that came with your iPhone, or another compatible cable, to connect your iPhone to the computer.

Step 2: Turn off your iPhone

1. Unplug your iPhone from the computer if it’s connected.
2. Turn off your iPhone : Press and hold both the side button and the Volume down button until the power off slider appears.

Step 3: Put your iPhone in recovery mode

1. Press and hold the Side power button while immediately connecting your iPhone to the computer. Don't let go of the button.
2. Keep holding the button until you see the recovery mode screen on your iPhone, then let go.

If you see the passcode screen, you need to turn off your iPhone and start again.

Step 4: Restore your iPhone

1. Locate your iPhone in the Finder or in iTunes on the computer that it’s connected to. (Learn how to find your connected iPhone.)
2. Choose Restore when you see the option to Restore or Update. Your computer downloads software for your iPhone and begins the restore process. If the download takes more than 15 minutes and your device exits the recovery mode screen, let the download finish, then turn off your iPhone and start again.

3 .Wait for the process to finish. 

4 . Disconnect your iPhone from the computer, then set up and use your iPhone. 

Hey there,

Try force restart your iPhone by this steps:

Press and quickly release the volume up button, press and quickly release the volume down button, then press and hold the side button. When the Apple logo appears, release the button.

Are you sure you are doing the steps correctly? What happened when you did these steps, did the phone restart or is it still freezing as it is?

Is the storage space full on your phone?