Write a function that filters a map based on a list of keys. The function should return a new map containing only the key-value pairs whose keys are in the given list.
Examples:
Input: originalMap = {'a' => 1, 'b' => 2, 'c' => 3}, keys = ['a', 'c']
Output: {'a' => 1, 'c' => 3}
Explanation: Only the keys 'a' and 'c' from the original map are included
Input: originalMap = {'x' => 10, 'y' => 20, 'z' => 30}, keys = ['y']
Output: {'y' => 20}
Explanation: Only the key 'y' from the original map is included
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