Don't use your fist! That's a good way to bend the ejector rod!
Try a folded business card, pushed in the cutout to rotate it back in place enough to open the cylinder.
Even my Python did that, it's more common than most want to admit.
Once degreased, I use a special tool to tighten it back up and I do use a speck of blue thread locker.
The tool prevents marring and I also use at least 3 spent shells when tightening the rod.
The spent shells are oversize and prevent the ejector star from rotating.
Pliers are bad, sometimes even with a leather piece to prevent marring, it can go through it, ruining the ejector rod.
While on the bench, check the sideplate screws and the small front screw on the rear sight for tightness.