how to unlock an engine ??
 

my engine (probably) seized due to lack of the oil flowing through the engine, because the oil light was on, (very ignorant then) and i kept driving anyway. when the engine died there wasnt any smoke or anything. you would've thought the engine seized. anyway, if its a faulty light or sensor or whatever, would it still lock the engine ?? i want to unlock it because its definitely locked. i heard many people write online that they put oil through the spark plug holes or something. does that work ?! any advice please ? i cannot afford a new car/ engine

i have a 97 camry v6, 3.0 liters