You have to use a fair bit of force. Just make sure you're using a blunt object that spreads the force as much as possible and be careful of the ribbon cable
for those who like me ripped out the ribbon cable that connects to the power button circuit board due to a bloated battery
i highly recommend salvaging your ribbon cable! there is excess ribbon cable that is tucked under the speaker (note that the ribbon cable is attached to the center port peel back the foam adhesive and you’ll have excess ribbon cable to route)
after which use a scissors to make a fresh straight cut followed by either a straight razor or a craft knife to scrape the plastic revealing the copper wires underneath. do about 2-3mm worth or just follow the ribbon cable that is still attached to the port on the circuit board.
a small note is to reuse the blue plastic piece to shim the newly exposed cable into the port and close the tab and it should work! (at least it did for me.)