Philocrat said:Some philosophers may not accept the statement 'close that door' as amounting to or constituting a true argument simply because it is a command.
All statements could be considered to be part of an argument, such as "shut the door", if the context of a situation is considered. Whether it's a good argument to shut the door or not is up to the unsaid statements that would make up the context of the argument.
An enthymeme is a good example. It is missing one premise. But it's still an argument. The context could imply others statements:
The wind is blowing. It's below zero. I have the flu. The door has been open for an hour. The heat is on full blast in the house, but it's going out the door. Shutting the door will stop the wind and cause the temperature to increase in the house.
The statement in this case, "shut the door", would make a great conclusion. Although is may be a command, a command implies a theory. The theory to shut the door. It based upon strong evidence. And therefore a good argument, although the contextual premises are unstated.