“What key has legs and can’t open doors?”/“A turkey.”

A popular Thanksgiving turkey riddle is:
 
Q: What key has legs and can’t open doors?
A: A turkey.
 
Te riddle has been cited in print since at least 1998.
 
“What’s the key to a great Thanksgiving dinner?”/“The turkey” is another key/turkey riddle.
 
   
Google Groups: ott.singles
Turkey Humour! (side note: alcohol is involved)
Amanda
12/2/98
(...)
Q. What key has legs and can’t open doors?
A. Turkey.
 
9 November 1999, Statesman Journal (Salem, OR), “Kids’ Jokes,” pg. 5D, col. 4:
WHAT KEY HAS LEGS AND CAN’T OPEN DOORS?
A turkey.
   
22 November 1999, Detroit (MI) Free Press, “Yak Yuks,” Yak’s Corner, pg. 2, col. 3:
What key has legs and can’t open doors?
A turkey.
From Bradley, 4.
 
Google Groups: alt.tasteless.jokes
What key has legs and can’t open doors?
Douglas D. Anderson
11/26/03
A tur key. HAHAHAHAHAHAHAHAHAH! Get it? It’s a *joke*!
     
Google Books
May 2006, Boys’ Life “Think & Grin,” pg. 58, col. 2:
Caleb: What key has legs and can’t open doors?
Caitiyn: What?
Caleb: A turkey.
Caleb Musser, Fort Worth, Tex.
 
Twitter
karlameachem
‏@karlameachem
What kind of key has legs but can’t open doors?  A tur-KEY!  LOL
4:18 PM - 12 Oct 2008
 
Twitter
Kelly Efurd Lawson
‏@KellyELawson
lame thanksgiving joke #2: What kind of key has legs and can’t open doors? A tur-key!
11:27 AM - 10 Nov 2008
 
Google Books
The Happy Classroom:
From Ha-Ha to A-Ha
By Janet Aaker Smith
Marion, IL: Pieces of Learning
2011
Pg. 87:
What key has legs and can’t open doors?
Turkey.
   
17 November 2013, Los Angeles (CA) Times, “The Kids’ Reading Room; Jokes & Riddles,” pg. H3, col. 2:
What key has legs and can’t open doors? A turkey!
Carina, 10
Centralia Elementary, Anaheim