Do you refrigerate after opening?

Most “natural” brands of peanut butter come with “Refrigerate after opening” printed on the label.

That’s fine. Must mean there are not a lot of chemical preservatives, one might reason.

But there’s a problem. After the PB has been in the fridge, it is no longer spreadable. So I wonder what other people do to soften it up.

Microwave it?

Or do others simply ignore the “Refrigerate” command in the first place?