Yes.The right to sanitation is an element of the right of everyone to an adequate standard of living for himself and his family (Article 11 of the International Covenant on Economic, Social and Cultural Rights or ICESCR).
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Many schools around the UK have a policy of locking school toilets during lesson times, with some even keeping them shut during breaks between classes. In schools where the toilets are locked, pupils sometimes have to request a key before they can use them.