return the two biggest numbers in a list of dictionaries

def return_key(a, b):
  return a[b]
    
def name_score(list_dict, key):
    max_score = max(list_dict, key = lambda x: return_key(x, key))
    list_dict.remove(max_score)
    max_score2nd = max(list_dict, key = lambda x: return_key(x, key))
    return max_score, max_score2nd
    
list_dict = [{'name': 'Tom', 'score': 10}, {'name': 'Jerry', 'score': 5}, {'name': 'Micky', 'score': 8}]
key = 'score'
name_score(list_dict, key)