narrow, cramped, confined
侷 centers on restricted space: being narrow, cramped, or confined. The given meanings all describe a lack of room or tightness.
侷 is a phono-semantic compound: the person radical 亻 suggests a human-related meaning, while 局 likely contributes the sound and the idea of being confined or limited. The exact historical development is uncertain.
A person 亻 squeezed into a tight office 局: the space is narrow and cramped, leaving no room to move.
For キョク, imagine a person stuck in a cramped room shouting 'kyoku!' in frustration: the invented sound 'kyoku' cues キョク while the person is confined.