@Override
    public V pollFirst() {
        return get(pollFirstAsync());
    }
@Test
    public void testPollFirst() {
        RScoredSortedSet<String> set = redisson.getScoredSortedSet("simple");
        Assertions.assertNull(set.pollFirst());

        set.add(0.1, "a");
        set.add(0.2, "b");
        set.add(0.3, "c");

        Assertions.assertEquals("a", set.pollFirst());
        assertThat(set).containsExactly("b", "c");
    }