How to break down a woman's emotional walls?

Ok so wen a woman's got her walls up, and she's pretty much automatically rejecting anything emotional but still interacting. How do you break that down?

So the scenario is we got close and the walls for some for some reason went up.

Ladies what's worked for you to get them down?

Guys have you managed to get over this situation and get the woman before?
How to break down a woman's emotional walls?
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