Stuck In A House

Riddle: You are locked in a house and you have four objects. You have a wooden chair, a ladder, a piano, and a rubber ax. You can only pick one object and you can't get out by breaking anything. What would you use to get out?

Answer: You use the piano KEYS to ulock the door!

Source: https://www.riddles.com/index.php/1237

You are locked in a house and you have four objects. You have a wooden chair, a ladder, a piano, and a rubber ax. You can only pick one object and you can't get out by breaking anything. What would you use to get out? — Stuck in a house by Anonymous v1.

Riddle: You are locked in a house and you have four objects. You have a wooden chair, a ladder, a piano, and a rubber ax. You can only pick one object and you can't get out by breaking anything. What would you use to get out? Answer: You use the piano KEYS to ulock the door! — by Anonymous v2.