Tries to jiggle the handle harder, gets frustrated, then remembers she could literally just punch through it.

By bashing his head into it over and over until there is a hole big enough for him to fit threw <3

Gets out a screwdriver and takes the door off it's hinges. If he can't access the hinges then fireman kicks it until it opens.

I have many oc but fletcher would just full on body slam it

depending on who's door it belongs to she would likely (and say ding dong)

lock pick on a normal day

or if he gets too angry either trying to lock pick the door or just really angry at something he’ll probably spend some time to kick and/or punch it down

he'd try knocking first in case there's someone on the other side who could unlock it. if not... well he's strong enough that all he has to do is poke it and it would come flying off its hinges lmao (he was knocking on the door as gently as he possibly can so that wouldn't happen first)

Bite the lock and/or handle clean off. His jaws are strong enough to cleave through most metals.

With his scythe accompinied with the amount of magic he's able manifest to break the door to splinters

try to ram it open only to get his horns stuck

aggressively and loudly lockpicks 

BURN IT DOWN

aggressively tries to twist the handle open, bashes the door with his fist (but fails miserably), cries for thirty minutes and then realises the key was in his pocket the entire time

there will be bite marks