clasp (fastener or holder)

unfasten; unbutton (if referring to buttons); undo (a fastening) / remove; take off / leave; slip away / evade, dodge, or attempt to do so / turn aside (the motion of something or intent of someone)

a revolving door

open (intransitive verb)

stopping

to open / to begin an event

to open, lift, uncover, unpack / to bloom / to start, open (a store)

Western-style door

platform door; platform screen door

(rail transport) selective door operation