I think I would say "put your legs/feet together" rather than "close your legs". You can use either "will" or "would" in that context.
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AnonymousIn the US (GPY is British), the phrase "close your legs" has obscene implications.I doubt there are any differences in the connotations between the US and the UK. In the UK it might also have such connotations, depending on the context and the mind of the listener.