closed, shut
閉 centers on the state of being shut or sealed off: something closed, not open, or blocked from access.
閉 combines 門 (gate) with 才, which likely acts as a phonetic component. The character suggests a gate being closed or shut.
Picture a heavy gate 門 being shut tight with a wooden bar 才 placed across it. The gate is now closed and sealed.
For ヘイ, imagine the heavy gate closing with a loud 'hey!' as someone shouts to stop it: hey -> ヘイ, and the gate slams shut.
closing; closure
to close (e.g. book, eyes, meeting, etc.); to shut
closing up shop (for the day)
to close; to shut
to be shut; to close; to be closed
opening and shutting; opening and closing
autism
to shut; to close; to fasten; to lock
shutting tightly; making airtight; sealing hermetically
blockage; blockade; blocking up; stoppage; obstruction; occlusion
closure (of a ceremony, event, meeting, etc.)
closing (for the day; of a library, museum, cinema, etc.)
confinement; imprisonment; incarceration
to lock up; to shut up; to imprison
falling of the curtain
closing of a park (e.g. theme park, botanical garden, etc.)
menopause
to be stumped; to be at a loss; to be at one's wits' end; to be nonplussed
confined place
closing of a gate