No matter how hard you try, I can open what you can't. If it wasn't for me, on your front porch you would stand. What am I?

Common Wrong Answers
“A door”
A door is the object that is opened, but it cannot open anything itself. The riddle is about something that can open doors, not the door itself.
“A lock”
A lock is the mechanism that requires a key to open; it cannot open anything by itself, which contradicts the riddle's clue of being able to open what you can't.
“A person”
While a person can open doors, the riddle specifically refers to an object that can open something that the listener cannot, which aligns with the function of a key.
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