Could someone explain to me how Collider2D.cast() works?, how to use it?

For days I've been trying to make Collider2D.Cast() work but it doesn't work at all, it doesn't detect any collisions. I'll leave a screenshot of my code for anyone who can explain to me why it doesn't work... Could someone explain to me how to use it? I left an image of my script for anyone who wants to see and help me.

and yes, it should return false...

PlayerDir() is a function to detect which side the player is looking at (Ex: Player is looking right, so Player Dir() returns Vector3.right.