Can you talk to your landlord about giving you access to the heater to control it, and offer to take responsibility for anything that might go wrong? That might be better than (illegally) breaking and entering a locked space that you aren't leased permission to access.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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