I’ve had a tremor my whole life. It’s getting worse the older I get. Sometimes using two hands helps but if not try using your full body. Rest your hand against your hip and lean forward. If all else fails, throw the keys away and grab a martini shaker. Be more fun!! ;)

@Carol_Sharkey, many moons ago, when I was in my "formative years", I was told that the best way to get a key in the lock when you're drunk was to put your thumb over the keyhole. put your key onto that thumb, then take that thumb away quickly. The key should go straight in the keyhole. I don't know whether this would work for you, but it would just confirm my misspent youth...........