Brand New iPhone 8 just died

iPhone

Find your model below to locate the SIM tray. To pop open the SIM tray, insert a paper clip or a SIM-eject tool into the hole beside the tray. Push in, towards the iPhone, but don’t force it. If you're having difficulty ejecting the SIM tray, take your device to your carrier or an Apple Store for help.

After you remove your SIM card from the tray, notice the notch in one corner of the new SIM card. Place the new SIM card into the tray—it will fit only one way, because of the notch. Then insert the tray into the device completely and in the same orientation that you removed it. The tray also fits only one way.

Find the SIM tray on the right side of your iPhone XR.

Remove or switch the SIM card in your iPhone or iPad - Apple Support

https://support.apple.com/en-in/HT201337

You don't say why you can't get the Sim out, for example are you using the special tool provided, but this may help.

Remove or switch the SIM card in your iPhone or iPad - Apple Support

If the card is not seated properly within the tray that can make it difficult to eject, the only way is to then keep moving the tray backwards and forwards by the small amount that it does move in the hope it eventually frees itself.

Whatever you do don't use any force though, you are just trying to gently ease the tray passed the restriction.

You may want to call in at your local Apple Store to let them deal with this though, after all the device is new and you wouldn't want to cause any damage that may then give rise to other issues.