No Apple can unlock your phone with the master key they used to generate your phone hardware enclave key. This is how the FBI has pressured them in the past to unlock devices.
The exact section is "Root Cryptographic Keys," here is the key passage:
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A randomly generated UID is fused into the SoC at manufacturing time. Starting with A9 SoCs, the UID is generated by the Secure Enclave TRNG during manufacturing and written to the fuses using a software process that runs entirely in the Secure Enclave. This process protects the UID from being visible outside the device during manufacturing and therefore isn’t available for access or storage by Apple or any of its suppliers.
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