Growling when he’s lying down

Hi everyone! :)

For a little while now, my 5-month-old puppy has been growling at me when he's lying down and I want him to move elsewhere. Let me explain.

Sometimes when we're back from a walk, just before going through the front door of my flat, my dog lies down and refuses to budge. Usually, I use a treat or something he likes to get him moving, but sometimes it doesn't work and he refuses to come inside because he's quite happy where he is.

As a result, I'm left with no choice but to carry him, but when I do, he starts growling quite loudly at me and mouths my arm. He doesn't hurt me, but I think it's a warning, like he's saying "Put me down right now!".

I have to admit, I burst out laughing every time because he really looks like a fussy little kid having a tantrum, which means sometimes I can't even pick him up because I've got no strength left from laughing. Anyway, that's just a side note.

So, I'm wondering:

- Knowing that I can't just give in to His Lordship's demands, could this turn into aggression over time? I mean, is there a risk he might actually bite me one day?

For context, I think I have a really good relationship with my pup; I play with him a lot and I respect him as a dog. I think we have a great bond, so there we go :)

Thanks for your help!