Both Uses

yield
in
The Lovely Bones
(Edited)

I pushed and pushed against the unyielding borders of my heaven.
Chpt 11 *

unyielding = unmovable

standard prefix: The prefix "un-" in unyielding means not and reverses the meaning of yielding. This is the same pattern you see in words like unhappy, unknown, and unlucky.
My sister told herself that she was inside a series of rooms and spaces that, gone through methodically, might yield what she needed, provide her the trophy she could take home to our father, earning her freedom from me that way.
Chpt 14 *

yield = provide

Definitions:

(1) (yield as in: will yield valuable data)
to produce (usually something wanted); or the thing or amount produced
(2) (yield as in: yield to pressure)
to give in, give way, or give up
(3) (meaning too rare to warrant focus)