get Lock Time
Optional lockTime, default value 0 means no time locking.
If all inputs have final (`0xffffffff`) sequence numbers then `lockTime` is irrelevant.
Otherwise, the transaction may not be added to a block until after `lockTime`.
value < 500000000 : Block number at which this transaction is unlocked
value >= 500000000 : UNIX timestamp at which this transaction is unlocked
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uint32 lock_time = 12;
Return
The lockTime.