It is a brilliant idea to ask a female colleague out.

Simple, you can find an excuse (overtime, so to speak) to stay with her in the company and invite her after work. If she had pushed you off, try again next time. If you shirk it like this next time, it means that there is basically no chance. Of course, if you really want to catch up with others and have no consciousness of becoming an immortal, you can make an exception and ask her out.