How do I open the sim tray on my iPhone 11?

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

See -> Remove or switch the SIM card in your iPhone

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

While the support article clearly states not to force it, sometimes it can be difficult with a paper clip to get it to pop out. The support centers use a SIM ejector tool that is stronger than a paperclip and is the right size to fit in the little hole to eject the SIM tray. You can keep trying or possibly take it to your cell carrier or Apple for assistance.

Visit an Apple Store or an Apple Authorized Reseller in your region for assistance to diagnose the problem.

And they could offer a possible solution.

You will first have to make an appointment due to the pandemic.

See: Contact Apple for support and service

Contact Apple for support and service - Apple Support