Sorry we're closed or Sorry, we're closed

[Hansman]

I have seen a sign saying that 'Sorry we're closed' on the door of a store and I was wondering if it should be 'Sorry, we're closed'.
Do native English speakers use the expression 'Sorry we're closed' without a comma for the situation or is a comma needed there to make sense?

 

[jutfrank]

The comma makes it clear that 'sorry' and 'we're closed' are two separate utterances, but I doubt that anyone reading a sign that doesn't include the comma will walk away thinking 'I wonder what that means'.

sorry were closed - Yahoo Image Search results

 

[tedmc]

I think signs tend to do away with punctuations for aesthetic reasons.

 

[Tarheel]

I think signs tend to do away with punctuations for aesthetic reasons.

Or the sign makers have a poor grasp of written English.

 

[Rover_KE]

That's right. I hate to see the very common HURRY OFFER ENDS AT MIDNIGHT.