Knockwurst has nothing to do with knocking on a door, but there are jokes.
     
“If you’re gonna burst through the door unannounced, waving a German sausage, knockwurst!” (meaning “knock first”) was posted on Twitter by Wynne McLaughlin on December 8, 2010. The joke was reposted on Twitter on June 23, 2012.
   
“The lowest ranked door to door salesperson is awarded a knockwurst” (meaning “knock worst”) was posted on Twitter by Binner on July 10, 2017. “Reminds me that the lowest ranked door-to-door salesman is awarded a knockwurst” was posted on Twitter by Binner on July 4, 2022.
   
 
Wikipedia: Knackwurst
Knackwurst (German pronunciation: [ˈknakˌvʊʁst]) (in North America sometimes spelled knockwurst) refers to a type of sausage of northern German origin from the mid-16th century. The many available varieties depend on the geographical region of their production.
       
Twitter
Scott McC
@scottmccrickard
Knockwurst on Heaven’s Door #meatsongs
3:13 PM · Aug 11, 2010·Twitter Web Client
   
Twitter
Wynne McLaughlin
@SpacemanQuisp
If you’re gonna burst through the door unannounced, waving a German sausage, knockwurst!
11:15 PM · Dec 8, 2010·Twitter Web Client
 
Twitter
Marie von den Benken
@Regendelfin
Bob Dylan - Knackwurst On Heavens Door   #Grillhits
4:22 AM · Apr 21, 2011·Twitter Web Client
   
Twitter
Nick Pettigrew🇺🇦
@Nick_Pettigrew
Replying to @TonyCowards
@TonyCowards Sign on the German Sausage Factory front door, “Please Knackwurst”.
10:23 AM · Jun 12, 2011·Twitter Web Client
       
Twitter
Wynne McLaughlin
@SpacemanQuisp
If you’re gonna burst through the door unannounced, waving a German sausage, knockwurst!
5:07 PM · Jun 23, 2012·Twitter Web Client
 
Twitter 
Gary Hallock
@LeerlessFeeder
#punsr KNOCKWURST: She has the ugliest pair of knockers you can imagine but I still a door her.
12:33 AM · Oct 18, 2012·Twitter Web Client
   
Twitter
Zach Davis
@ForTweetsNSuch
Who’s That Knockwurst at My Door? #RuinAMovieWithSausage
4:08 PM · Dec 8, 2014·Twitter for iPhone
   
Twitter
Dan Mallon
@MallonDan
Replying to @MallonDan
. @TheHashtagGame “Knock Knock Knockwurst On Heaven’s Door” #MeatASong
11:42 PM · Jan 5, 2015 from Penndel, PA·Twitter for iPhone
 
Twitter
Jeff Girgenti
@jeffgirgenti
#ReplaceASongTitleWithSausage
Knackwurst on Heaven’s Door
@bobdylan
10:54 PM · Mar 14, 2015·Twitter Web Client
   
Twitter
Whimsical Wordsmith
@Whimsical84
Knockwurst is my favorite food that rates rapping on a door.
10:04 PM · May 29, 2016·Twitter for iPhone
   
Twitter
Binner
@BinnerJr
The lowest ranked door to door salesperson is awarded a knockwurst.
8:35 PM · Jul 10, 2017·Twitter for iPhone
   
Twitter
Jason Evans
@citizenjason5
The last sausage maker on Earth sat in a room. There was a knockwurst on the door.
9:06 AM · Sep 5, 2017·Twitter Web Client
   
Twitter
Farbeka Be It For Me To Say 🇺🇦🇺🇦
@Farbeka
@DocAtCDI
What kind of meat can’t remember the secret signal to open the door of a “speakeasy.”
Knockwurst
#WashYourHands
10:44 PM · Mar 24, 2020·Twitter Web App
 
Twitter
Binner
@BinnerJr
Replying to @BobGolen
Reminds me that the lowest ranked door-to-door salesman is awarded a knockwurst.
11:31 AM · Jul 4, 2022·Twitter for iPhone