I have recently moved to france and have been learning french for the last few years (long before moving). I still have difficulty with lunch conversation and after speaking to everyone outside of work in french I appreciate it so much that I work at an international place where everyone speaks english, even though that is also a second language for me. Imagine how tired your colleagues are at lunch after not speaking their own language anywhere but at home and appreciate that you are capable of helping them a little bit by speaking english.