Two perfectly reasonable explanations, not that one is really needed.
1/ Come on guys it's a doggy door, a motivated zombie could push through it fairly easily. Lee and his group didn't kick it in when they found the mansion because they were literally surrounded by riled up walkers that were looking for them and it would have made a loud noise and given away their location.
2/ Alternatively, maybe Clem unlocked it from inside when she left at the end of episode 4, I guess Lee would have had that door secured and maybe that was the only way Clem could get outside?
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