Yeah you could give it a go from the doorway first in case that works. Best to do as little as necessary.
There are dev leaps at birthdays and half birthdays and for lots of LOs this can affect their sleep for a bit, perhaps making it harder for them to settle, or more disturbed during the night. Maybe this is what is going on with your DS? If you can do as little as possible (which it sounds like you are doing) during this period of disturbed sleep then once he's less "disturbed" (not the best word but I hope you kwim) he should get back on track quicker cos he won't have picked up so many "bad habits".
I find it's helpful to be aware that lots of LOs go through patches of wonky sleep on and off throughout toddlerhood and during their early years, even if they were previously great sleepers. It's quite normal (if tiring) and as long and you just respond with the minimum help needed, they should get back on track quite quickly.
HTH x