Solving this riddle will be as easy as shooting fish in me

Nature’s yellow marker. With floating seeds. It sounds like a character from a Caribbean kids show, about the king of the jungle.

I prevent doors from opening, unless I get a key, but not just any, to do so. I am also susceptible to criminals that would force me to open.

No matter who or what is put on me, I measure them all. I am used both in a doctor's office and a chef's kitchen. I am also associated with judges in a courtroom.

I’m made of steps, yet not your feet, I grow with every mile you meet. No single place can call me home, I’m what you take each time you roam.