I have often observed that "young men" (I am 62, so anyone under 40 is a young man) often ask about dating and relationships. Rest assured, young men, old men don't have the answers either... But, like driving, it becomes more natural with practice and experience.
I often see videos with titles like "Say this and women can't say no," or "How to talk to a woman." There is lots of bad advice available and without experience it is easy to fall prey to the snake oil salesmen.
Since the headline grabbed your attention, I will get to my one and only "pickup" line. It works every time. The answer may be a "yes" or a "no, thank you, maybe later" but the line never fails to get a response.
Here it is: May I have this dance?
The invitation is always extended in a polite and courteous manner, with an offered hand to help the lady up from her chair should she accept. If she declines, then the hand comes to my chest in a show of respect with a slight bow, and "perhaps, later then."
Once you are on the dance floor (and if the music is not to loud) you can engage in pleasant conversation, make her laugh, demonstrate courteous, respect, and a willingness to take action. After the dance you ALWAYS escort the lady back to her table.
Gentlemen don't need pickup lines. They just need to be confident and courteous.
Because of my dance etiquette, courtesy, and always being a gentleman, I was recruited to part of an international program that teaches students to be ladies and gentlemen through social dance.