You’ve basically got to bend the metal hinge inwards again so that the case will close.
The easiest way is to take the plastic top out of the hinge, bend it inwards and then slot the top back in to see if it closes.
This got mine most of the way but there was still off by a fraction so they kept turning on in the case.
So to squish it, I personally put a heavy book on top and left it for a while, but ultimately you’ve just got to apply some pressure.
The plastic top snapped off the hinge entirely not long after that, so I had to glue it back on but even then the slightest bend snaps it off again. So be very careful as it’s very weak and definitely a design flaw.